DataGridView.cs source code in C# .NET

                        
Code:
                         / Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / WinForms / Managed / System / WinForms / DataGridView.cs / 1 / DataGridView.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms 
{ 
    using System.Text;
    using System.Runtime.InteropServices; 
    using System.Runtime.Remoting;
    using System.ComponentModel;
    using System;
    using System.Diagnostics.CodeAnalysis; 
    using System.Security;
    using System.Security.Permissions; 
    using System.Collections; 
    using System.Windows.Forms;
    using System.Windows.Forms.Design; 
    using System.ComponentModel.Design;
    using System.Drawing;
    using System.Windows.Forms.ComponentModel;
    using System.Windows.Forms.Layout; 
    using System.Globalization;
    using System.Diagnostics; 
    using System.Windows.Forms.VisualStyles; 
    using Microsoft.Win32;
    using System.Collections.Specialized; 

    /// 
    [
        ComVisible(true), 
        ClassInterface(ClassInterfaceType.AutoDispatch),
        Designer("System.Windows.Forms.Design.DataGridViewDesigner, " + AssemblyRef.SystemDesign), 
        //DefaultProperty("DataSource"), 
        DefaultEvent("CellContentClick"),
        ComplexBindingProperties("DataSource", "DataMember"), 
        Docking(DockingBehavior.Ask),
        Editor("System.Windows.Forms.Design.DataGridViewComponentEditor, " + AssemblyRef.SystemDesign, typeof(ComponentEditor)),
        SRDescription(SR.DescriptionDataGridView)
    ] 
    public partial class DataGridView : Control, ISupportInitialize
    { 
        private static readonly object EVENT_DATAGRIDVIEWALLOWUSERTOADDROWSCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWALLOWUSERTODELETEROWSCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWALLOWUSERTOORDERCOLUMNSCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWALLOWUSERTORESIZECOLUMNSCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWALLOWUSERTORESIZEROWSCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWALTERNATINGROWSDEFAULTCELLSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWAUTOGENERATECOLUMNSCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWAUTOSIZECOLUMNMODECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWAUTOSIZECOLUMNSMODECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWAUTOSIZEROWSMODECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWBACKGROUNDCOLORCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWBORDERSTYLECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCANCELROWEDIT = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLBEGINEDIT = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLBORDERSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLCLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLCONTENTCLICK = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLCONTENTDOUBLECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLCONTEXTMENUSTRIPCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLCONTEXTMENUSTRIPNEEDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLDOUBLECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLENDEDIT = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLENTER = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLERRORTEXTCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLERRORTEXTNEEDED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLFORMATTING = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLLEAVE = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSEDOUBLECLICK = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSEDOWN = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSEENTER = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSELEAVE = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSEMOVE = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSEUP = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLPAINTING = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLPARSING = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLSTATECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLSTYLECONTENTCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLTOOLTIPTEXTCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLTOOLTIPTEXTNEEDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLVALIDATING = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLVALIDATED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLVALUECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLVALUENEEDED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLVALUEPUSHED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNADDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNCONTEXTMENUSTRIPCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNDATAPROPERTYNAMECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNDEFAULTCELLSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNDISPLAYINDEXCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNDIVIDERWIDTHCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERCELLCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNDIVIDERDOUBLECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERMOUSECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERMOUSEDOUBLECLICK = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERSBORDERSTYLECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERSDEFAULTCELLSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERSHEIGHTCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERSHEIGHTSIZEMODECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNMINIMUMWIDTHCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNNAMECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNREMOVED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNSORTMODECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNSTATECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNTOOLTIPTEXTCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNWIDTHCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCURRENTCELLCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCURRENTCELLDIRTYSTATECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWDATABINDINGCOMPLETE = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWDATAERROR = new object();
        private static readonly object EVENT_DATAGRIDVIEWDATAMEMBERCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWDATASOURCECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWDEFAULTCELLSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWDEFAULTVALUESNEEDED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWEDITINGCONTROLSHOWING = new object();
        private static readonly object EVENT_DATAGRIDVIEWEDITMODECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWGRIDCOLORCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWMULTISELECTCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWNEWROWNEEDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWREADONLYCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWCONTEXTMENUSTRIPCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWCONTEXTMENUSTRIPNEEDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWDEFAULTCELLSTYLECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWDIRTYSTATENEEDED = new Object();
        private static readonly object EVENT_DATAGRIDVIEWROWDIVIDERHEIGHTCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWENTER = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWERRORTEXTCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWERRORTEXTNEEDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERCELLCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWDIVIDERDOUBLECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERMOUSECLICK = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERMOUSEDOUBLECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERSBORDERSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERSDEFAULTCELLSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERSWIDTHCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERSWIDTHSIZEMODECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWHEIGHTCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWHEIGHTINFONEEDED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWHEIGHTINFOPUSHED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWLEAVE = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWMINIMUMHEIGHTCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWPOSTPAINT = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWPREPAINT = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWSADDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWSDEFAULTCELLSTYLECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWSREMOVED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWSTATECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWUNSHARED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWVALIDATED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWVALIDATING = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWSCROLL = new object();
        private static readonly object EVENT_DATAGRIDVIEWSELECTIONCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWSORTCOMPARE = new object();
        private static readonly object EVENT_DATAGRIDVIEWSORTED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWUSERADDEDROW = new object();
        private static readonly object EVENT_DATAGRIDVIEWUSERDELETEDROW = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWUSERDELETINGROW = new object(); 

        private const int DATAGRIDVIEWSTATE1_allowUserToAddRows           = 0x00000001; 
        private const int DATAGRIDVIEWSTATE1_allowUserToDeleteRows        = 0x00000002;
        private const int DATAGRIDVIEWSTATE1_allowUserToOrderColumns      = 0x00000004;
        private const int DATAGRIDVIEWSTATE1_columnHeadersVisible         = 0x00000008;
        private const int DATAGRIDVIEWSTATE1_rowHeadersVisible            = 0x00000010; 
        private const int DATAGRIDVIEWSTATE1_forwardCharMessage           = 0x00000020;
        private const int DATAGRIDVIEWSTATE1_leavingWithTabKey            = 0x00000040; 
        private const int DATAGRIDVIEWSTATE1_multiSelect                  = 0x00000080; 
        private const int DATAGRIDVIEWSTATE1_ignoringEditingChanges       = 0x00000200;
        private const int DATAGRIDVIEWSTATE1_ambientForeColor             = 0x00000400; 
        private const int DATAGRIDVIEWSTATE1_scrolledSinceMouseDown       = 0x00000800;
        private const int DATAGRIDVIEWSTATE1_editingControlHidden         = 0x00001000;
        private const int DATAGRIDVIEWSTATE1_standardTab                  = 0x00002000;
        private const int DATAGRIDVIEWSTATE1_editingControlChanging       = 0x00004000; 
        private const int DATAGRIDVIEWSTATE1_currentCellInEditMode        = 0x00008000;
        private const int DATAGRIDVIEWSTATE1_virtualMode                  = 0x00010000; 
        private const int DATAGRIDVIEWSTATE1_editedCellChanged            = 0x00020000; 
        private const int DATAGRIDVIEWSTATE1_editedRowChanged             = 0x00040000;
        private const int DATAGRIDVIEWSTATE1_newRowEdited                 = 0x00080000; 
        private const int DATAGRIDVIEWSTATE1_readOnly                     = 0x00100000;
        private const int DATAGRIDVIEWSTATE1_newRowCreatedByEditing       = 0x00200000;
        private const int DATAGRIDVIEWSTATE1_temporarilyResetCurrentCell  = 0x00400000;
        private const int DATAGRIDVIEWSTATE1_autoGenerateColumns          = 0x00800000; 
        private const int DATAGRIDVIEWSTATE1_customCursorSet              = 0x01000000;
        private const int DATAGRIDVIEWSTATE1_ambientFont                  = 0x02000000; 
        private const int DATAGRIDVIEWSTATE1_ambientColumnHeadersFont     = 0x04000000; 
        private const int DATAGRIDVIEWSTATE1_ambientRowHeadersFont        = 0x08000000;
        private const int DATAGRIDVIEWSTATE1_isRestrictedChecked          = 0x10000000; 
        private const int DATAGRIDVIEWSTATE1_isRestricted                 = 0x20000000;
        private const int DATAGRIDVIEWSTATE1_isAutoSized                  = 0x40000000;

        // DATAGRIDVIEWSTATE2_ 
        private const int DATAGRIDVIEWSTATE2_showEditingIcon               = 0x00000001;
        private const int DATAGRIDVIEWSTATE2_allowUserToResizeColumns      = 0x00000002; 
        private const int DATAGRIDVIEWSTATE2_allowUserToResizeRows         = 0x00000004; 
        private const int DATAGRIDVIEWSTATE2_mouseOverRemovedEditingCtrl   = 0x00000008;
        private const int DATAGRIDVIEWSTATE2_mouseOverRemovedEditingPanel  = 0x00000010; 
        private const int DATAGRIDVIEWSTATE2_mouseEnterExpected            = 0x00000020;
        private const int DATAGRIDVIEWSTATE2_enableHeadersVisualStyles     = 0x00000040;
        private const int DATAGRIDVIEWSTATE2_showCellErrors                = 0x00000080;
        private const int DATAGRIDVIEWSTATE2_showCellToolTips              = 0x00000100; 
        private const int DATAGRIDVIEWSTATE2_showRowErrors                 = 0x00000200;
        private const int DATAGRIDVIEWSTATE2_showColumnRelocationInsertion = 0x00000400; 
        private const int DATAGRIDVIEWSTATE2_rightToLeftMode               = 0x00000800; 
        private const int DATAGRIDVIEWSTATE2_rightToLeftValid              = 0x00001000;
        private const int DATAGRIDVIEWSTATE2_currentCellWantsInputKey      = 0x00002000; 
        private const int DATAGRIDVIEWSTATE2_stopRaisingVerticalScroll     = 0x00004000;
        private const int DATAGRIDVIEWSTATE2_stopRaisingHorizontalScroll   = 0x00008000;
        private const int DATAGRIDVIEWSTATE2_replacedCellSelected          = 0x00010000;
        private const int DATAGRIDVIEWSTATE2_replacedCellReadOnly          = 0x00020000; 
        private const int DATAGRIDVIEWSTATE2_raiseSelectionChanged         = 0x00040000;
        private const int DATAGRIDVIEWSTATE2_initializing                  = 0x00080000; 
        private const int DATAGRIDVIEWSTATE2_autoSizedWithoutHandle        = 0x00100000; 
        private const int DATAGRIDVIEWSTATE2_ignoreCursorChange            = 0x00200000;
        private const int DATAGRIDVIEWSTATE2_rowsCollectionClearedInSetCell= 0x00400000; 
        private const int DATAGRIDVIEWSTATE2_nextMouseUpIsDouble           = 0x00800000;
        private const int DATAGRIDVIEWSTATE2_inBindingContextChanged       = 0x01000000;
        private const int DATAGRIDVIEWSTATE2_allowHorizontalScrollbar      = 0x02000000;
        private const int DATAGRIDVIEWSTATE2_usedFillWeightsDirty          = 0x04000000; 
        private const int DATAGRIDVIEWSTATE2_messageFromEditingCtrls       = 0x08000000;
        private const int DATAGRIDVIEWSTATE2_cellMouseDownInContentBounds  = 0x10000000; 
        private const int DATAGRIDVIEWSTATE2_discardEditingControl         = 0x20000000; 

        // DATAGRIDVIEWOPER_ 
        private const int DATAGRIDVIEWOPER_trackColResize                = 0x00000001;
        private const int DATAGRIDVIEWOPER_trackRowResize                = 0x00000002;
        private const int DATAGRIDVIEWOPER_trackColSelect                = 0x00000004;
        private const int DATAGRIDVIEWOPER_trackRowSelect                = 0x00000008; 
        private const int DATAGRIDVIEWOPER_trackCellSelect               = 0x00000010;
        private const int DATAGRIDVIEWOPER_trackColRelocation            = 0x00000020; 
        private const int DATAGRIDVIEWOPER_inSort                        = 0x00000040; 
        private const int DATAGRIDVIEWOPER_trackColHeadersResize         = 0x00000080;
        private const int DATAGRIDVIEWOPER_trackRowHeadersResize         = 0x00000100; 
        private const int DATAGRIDVIEWOPER_trackMouseMoves               = 0x00000200;
        private const int DATAGRIDVIEWOPER_inRefreshColumns              = 0x00000400;
        private const int DATAGRIDVIEWOPER_inDisplayIndexAdjustments     = 0x00000800;
        private const int DATAGRIDVIEWOPER_lastEditCtrlClickDoubled      = 0x00001000; 
        private const int DATAGRIDVIEWOPER_inMouseDown                   = 0x00002000;
        private const int DATAGRIDVIEWOPER_inReadOnlyChange              = 0x00004000; 
        private const int DATAGRIDVIEWOPER_inCellValidating              = 0x00008000; 
        private const int DATAGRIDVIEWOPER_inBorderStyleChange           = 0x00010000;
        private const int DATAGRIDVIEWOPER_inCurrentCellChange           = 0x00020000; 
        private const int DATAGRIDVIEWOPER_inAdjustFillingColumns        = 0x00040000;
        private const int DATAGRIDVIEWOPER_inAdjustFillingColumn         = 0x00080000;
        private const int DATAGRIDVIEWOPER_inDispose                     = 0x00100000;
        private const int DATAGRIDVIEWOPER_inBeginEdit                   = 0x00200000; 
        private const int DATAGRIDVIEWOPER_inEndEdit                     = 0x00400000;
        private const int DATAGRIDVIEWOPER_resizingOperationAboutToStart = 0x00800000; 
 
        private static Size DragSize = SystemInformation.DragSize;
 
        private const byte DATAGRIDVIEW_columnSizingHotZone = 6;
        private const byte DATAGRIDVIEW_rowSizingHotZone = 5;
        private const byte DATAGRIDVIEW_insertionBarWidth = 3;
        private const byte DATAGRIDVIEW_bulkPaintThreshold = 8; 

        private const string DATAGRIDVIEW_htmlPrefix = "Version:1.0\r\nStartHTML:00000097\r\nEndHTML:{0}\r\nStartFragment:00000133\r\nEndFragment:{1}\r\n"; 
        private const string DATAGRIDVIEW_htmlStartFragment = "\r\n\r\n"; 
        private const string DATAGRIDVIEW_htmlEndFragment = "\r\n\r\n\r\n";
 
        private System.Collections.Specialized.BitVector32 dataGridViewState1;  // see DATAGRIDVIEWSTATE1_ consts above
        private System.Collections.Specialized.BitVector32 dataGridViewState2;  // see DATAGRIDVIEWSTATE2_ consts above
        private System.Collections.Specialized.BitVector32 dataGridViewOper;   // see DATAGRIDVIEWOPER_ consts above
 
        private const BorderStyle defaultBorderStyle = BorderStyle.FixedSingle;
        private const DataGridViewAdvancedCellBorderStyle defaultAdvancedCellBorderStyle = DataGridViewAdvancedCellBorderStyle.Single; 
        private const DataGridViewAdvancedCellBorderStyle defaultAdvancedRowHeadersBorderStyle = DataGridViewAdvancedCellBorderStyle.OutsetPartial; 
        private const DataGridViewAdvancedCellBorderStyle defaultAdvancedColumnHeadersBorderStyle = DataGridViewAdvancedCellBorderStyle.OutsetPartial;
 
        private const DataGridViewSelectionMode defaultSelectionMode = DataGridViewSelectionMode.RowHeaderSelect;
        private const DataGridViewEditMode defaultEditMode = DataGridViewEditMode.EditOnKeystrokeOrF2;

        private const DataGridViewAutoSizeRowCriteriaInternal invalidDataGridViewAutoSizeRowCriteriaInternalMask = ~(DataGridViewAutoSizeRowCriteriaInternal.Header | DataGridViewAutoSizeRowCriteriaInternal.AllColumns); 

        private SolidBrush backgroundBrush = DefaultBackgroundBrush; 
        private Pen gridPen; 
        private Cursor oldCursor;
 
        private Graphics cachedGraphics;

        private HScrollBar horizScrollBar = new HScrollBar();
        private VScrollBar vertScrollBar = new VScrollBar(); 
        private DataGridViewHeaderCell topLeftHeaderCell;
 
        private DataGridViewRow rowTemplate; 
        private DataGridViewRowCollection dataGridViewRows;
        private DataGridViewColumnCollection dataGridViewColumns; 

        private DataGridViewCellStyle placeholderCellStyle;
        private StringFormat placeholderStringFormat;
 
        private DataGridViewColumn sortedColumn;
        private SortOrder sortOrder; 
 
        private object uneditedFormattedValue;
        private Control editingControl, latestEditingControl, cachedEditingControl; 
        private Panel editingPanel;
        private Point ptCurrentCell, ptCurrentCellCache = Point.Empty, ptAnchorCell, ptMouseDownCell, ptMouseEnteredCell, ptToolTipCell, ptMouseDownGridCoord;

        private DataGridViewSelectionMode selectionMode; 
        private DataGridViewEditMode editMode;
 
        // Note that a cell can only be in one bag but not both at the same time. 
        private DataGridViewCellLinkedList individualSelectedCells;
        private DataGridViewCellLinkedList individualReadOnlyCells; 
        private DataGridViewIntLinkedList selectedBandIndexes;
        private DataGridViewIntLinkedList selectedBandSnapshotIndexes;

        private DataGridViewCellStyle defaultCellStyle, columnHeadersDefaultCellStyle, rowHeadersDefaultCellStyle; 
        private DataGridViewCellStyle rowsDefaultCellStyle, alternatingRowsDefaultCellStyle;
        private ScrollBars scrollBars; 
        private LayoutData layout; 
        private DisplayedBandsData displayedBandsInfo;
        private Rectangle normalClientRectangle; 
        private ArrayList lstRows;
        private int availableWidthForFillColumns;

        private BorderStyle borderStyle; 
        private DataGridViewAdvancedBorderStyle advancedCellBorderStyle;
        private DataGridViewAdvancedBorderStyle advancedRowHeadersBorderStyle; 
        private DataGridViewAdvancedBorderStyle advancedColumnHeadersBorderStyle; 

        private DataGridViewClipboardCopyMode clipboardCopyMode; 

        private const int minimumRowHeadersWidth = 4;
        private const int minimumColumnHeadersHeight = 4;
        private const int defaultRowHeadersWidth = 41; 
        private const int maxHeadersThickness = 32768;
        private const int upperSize = 0x007FFFFF; 
        private int rowHeadersWidth = defaultRowHeadersWidth; 
        private int cachedRowHeadersWidth;
        private const int defaultColumnHeadersHeight = 23; 
        private int columnHeadersHeight = defaultColumnHeadersHeight;
        private int cachedColumnHeadersHeight;
        private DataGridViewAutoSizeRowsMode autoSizeRowsMode;
        private DataGridViewAutoSizeColumnsMode autoSizeColumnsMode; 
        private DataGridViewColumnHeadersHeightSizeMode columnHeadersHeightSizeMode;
        private DataGridViewRowHeadersWidthSizeMode rowHeadersWidthSizeMode; 
 
        private DataGridViewCellStyleChangedEventArgs dgvcsce;
        private DataGridViewCellPaintingEventArgs dgvcpe; 
        private DataGridViewCellValueEventArgs dgvcve;
        private DataGridViewRowHeightInfoNeededEventArgs dgvrhine;
        private DataGridViewRowPostPaintEventArgs dgvrpope;
        private DataGridViewRowPrePaintEventArgs dgvrprpe; 

        // the sum of the widths in pixels of the scrolling columns preceding 
        // the first visible scrolling column 
        private int horizontalOffset;
 
        // the sum of the heights in pixels of the scrolling rows preceding
        // the first visible scrolling row
        private int verticalOffset;
 
        // the number of pixels of the firstDisplayedScrollingCol which are not visible
        private int negOffset; 
 
        // the index of the potential 'new' row. -1 if there is no 'new' row.
        private int newRowIndex = -1; 

        // residual fraction of WHEEL_DELTA (120) for wheel scrolling
        private int cumulativeVerticalWheelDelta;
        private int cumulativeHorizontalWheelDelta; 

        private int trackColAnchor; 
        private int trackColumn = -1; 
        private int trackColumnEdge = -1;
        private int trackRowAnchor; 
        private int trackRow = -1;
        private int trackRowEdge = -1;
        private int lastHeaderShadow = -1;
        private int currentColSplitBar = -1, lastColSplitBar = -1; 
        private int currentRowSplitBar = -1, lastRowSplitBar = -1;
        private int mouseBarOffset; 
        private int noDimensionChangeCount; 
        private int noSelectionChangeCount;
        private int noAutoSizeCount; 
        private int inBulkPaintCount;
        private int inBulkLayoutCount;
        private int inPerformLayoutCount;
 
        private System.Windows.Forms.Timer vertScrollTimer, horizScrollTimer;
 
        private Hashtable converters; 
        private Hashtable pens;
        private Hashtable brushes; 

        private NativeMethods.RECT[] cachedScrollableRegion;

        // DataBinding 
        private DataGridViewDataConnection dataConnection;
 
        // ToolTip 
        private DataGridViewToolTip toolTipControl;
        // the tool tip string we get from cells 
        private string toolTipCaption = String.Empty;

        private const int maxTTDISPINFOBufferLength = 80;
 
        // Last Mouse Click Info
        private MouseClickInfo lastMouseClickInfo; 
 
#if DEBUG
        // set to false when the grid is not in [....] with the underlying data store 
        // in virtual mode, and OnCellValueNeeded cannot be called.
        internal bool dataStoreAccessAllowed = true;
#endif
        ///  
        /// 
        /// Initializes a new instance of the  class. 
        ///  
        public DataGridView()
        { 
            SetStyle(ControlStyles.UserPaint |
                     ControlStyles.Opaque |
                     ControlStyles.UserMouse, true);
 
            SetStyle(ControlStyles.SupportsTransparentBackColor, false);
 
            // this class overrides GetPreferredSizeCore, let Control automatically cache the result 
            SetState2(STATE2_USEPREFERREDSIZECACHE, true);
 
            this.dataGridViewState1 = new System.Collections.Specialized.BitVector32(0x00000000);
            this.dataGridViewState2 = new System.Collections.Specialized.BitVector32(0x00000000);
            this.dataGridViewOper   = new System.Collections.Specialized.BitVector32(0x00000000);
 
            this.dataGridViewState1[  DATAGRIDVIEWSTATE1_columnHeadersVisible
                                    | DATAGRIDVIEWSTATE1_rowHeadersVisible 
                                    | DATAGRIDVIEWSTATE1_autoGenerateColumns 
                                    | DATAGRIDVIEWSTATE1_allowUserToAddRows
                                    | DATAGRIDVIEWSTATE1_allowUserToDeleteRows ] = true; 



            this.dataGridViewState2[  DATAGRIDVIEWSTATE2_showEditingIcon 
                                    | DATAGRIDVIEWSTATE2_enableHeadersVisualStyles
                                    | DATAGRIDVIEWSTATE2_mouseEnterExpected 
                                    | DATAGRIDVIEWSTATE2_allowUserToResizeColumns 
                                    | DATAGRIDVIEWSTATE2_allowUserToResizeRows
                                    | DATAGRIDVIEWSTATE2_showCellToolTips 
                                    | DATAGRIDVIEWSTATE2_showCellErrors
                                    | DATAGRIDVIEWSTATE2_showRowErrors
                                    | DATAGRIDVIEWSTATE2_allowHorizontalScrollbar
                                    | DATAGRIDVIEWSTATE2_usedFillWeightsDirty ] = true; 

 
            this.displayedBandsInfo = new DisplayedBandsData(); 
            this.lstRows = new ArrayList();
 
            this.converters = new Hashtable(8);
            this.pens = new Hashtable(8);
            this.brushes = new Hashtable(10);
            this.gridPen = new Pen(DefaultGridColor); 

            this.selectedBandIndexes = new DataGridViewIntLinkedList(); 
            this.individualSelectedCells = new DataGridViewCellLinkedList(); 
            this.individualReadOnlyCells = new DataGridViewCellLinkedList();
 
            this.advancedCellBorderStyle = new DataGridViewAdvancedBorderStyle(this,
                DataGridViewAdvancedCellBorderStyle.OutsetDouble,
                DataGridViewAdvancedCellBorderStyle.OutsetPartial,
                DataGridViewAdvancedCellBorderStyle.InsetDouble); 
            this.advancedRowHeadersBorderStyle = new DataGridViewAdvancedBorderStyle(this);
            this.advancedColumnHeadersBorderStyle = new DataGridViewAdvancedBorderStyle(this); 
            this.advancedCellBorderStyle.All = defaultAdvancedCellBorderStyle; 
            this.advancedRowHeadersBorderStyle.All = defaultAdvancedRowHeadersBorderStyle;
            this.advancedColumnHeadersBorderStyle.All = defaultAdvancedColumnHeadersBorderStyle; 
            this.borderStyle = defaultBorderStyle;
            this.dataGridViewState1[DATAGRIDVIEWSTATE1_multiSelect] = true;
            this.selectionMode = defaultSelectionMode;
            this.editMode = defaultEditMode; 
            this.autoSizeRowsMode = DataGridViewAutoSizeRowsMode.None;
            this.autoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None; 
            this.columnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.EnableResizing; 
            this.rowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.EnableResizing;
 
            this.clipboardCopyMode = DataGridViewClipboardCopyMode.EnableWithAutoHeaderText;

            this.layout = new LayoutData();
            this.layout.TopLeftHeader        = Rectangle.Empty; 
            this.layout.ColumnHeaders        = Rectangle.Empty;
            this.layout.RowHeaders           = Rectangle.Empty; 
            this.layout.ColumnHeadersVisible = true; 
            this.layout.RowHeadersVisible    = true;
            this.layout.ClientRectangle      = this.ClientRectangle; 

            this.scrollBars = ScrollBars.Both;

            this.horizScrollBar.RightToLeft = RightToLeft.Inherit; 
            this.horizScrollBar.AccessibleName = SR.GetString(SR.DataGridView_AccHorizontalScrollBarAccName);
            this.horizScrollBar.Top = this.ClientRectangle.Height - horizScrollBar.Height; 
            this.horizScrollBar.Left = 0; 
            this.horizScrollBar.Visible = false;
            this.horizScrollBar.Scroll += new ScrollEventHandler(DataGridViewHScrolled); 
            this.Controls.Add(this.horizScrollBar);

            this.vertScrollBar.Top = 0;
            this.vertScrollBar.AccessibleName = SR.GetString(SR.DataGridView_AccVerticalScrollBarAccName); 
            this.vertScrollBar.Left = this.ClientRectangle.Width - vertScrollBar.Width;
            this.vertScrollBar.Visible = false; 
            this.vertScrollBar.Scroll += new ScrollEventHandler(DataGridViewVScrolled); 
            this.Controls.Add(this.vertScrollBar);
 
            this.ptCurrentCell = new Point(-1, -1);
            this.ptAnchorCell = new Point(-1, -1);
            this.ptMouseDownCell = new Point(-2, -2);
            this.ptMouseEnteredCell = new Point(-2, -2); 
            this.ptToolTipCell = new Point(-1, -1);
            this.ptMouseDownGridCoord = new Point(-1, -1); 
 
            this.sortOrder = SortOrder.None;
 
            this.lastMouseClickInfo.timeStamp = 0;

            WireScrollBarsEvents();
            PerformLayout(); 

            this.toolTipControl = new DataGridViewToolTip(this); 
 
            Invalidate();
        } 

        /// 
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ] 
        public virtual DataGridViewAdvancedBorderStyle AdjustedTopLeftHeaderBorderStyle
        { 
            get
            {
                DataGridViewAdvancedBorderStyle dgvabs;
                if (this.ApplyVisualStylesToHeaderCells) 
                {
                    switch (this.AdvancedColumnHeadersBorderStyle.All) 
                    { 
                        case DataGridViewAdvancedCellBorderStyle.OutsetDouble:
                        case DataGridViewAdvancedCellBorderStyle.OutsetPartial: 
                            dgvabs = new DataGridViewAdvancedBorderStyle();
                            if (this.RightToLeftInternal)
                            {
                                dgvabs.LeftInternal = DataGridViewAdvancedCellBorderStyle.Outset; 
                            }
                            else 
                            { 
                                dgvabs.LeftInternal = DataGridViewAdvancedCellBorderStyle.OutsetDouble;
                            } 
                            dgvabs.RightInternal = DataGridViewAdvancedCellBorderStyle.Outset;
                            dgvabs.TopInternal = DataGridViewAdvancedCellBorderStyle.OutsetDouble;
                            dgvabs.BottomInternal = DataGridViewAdvancedCellBorderStyle.Outset;
                            break; 

                        case DataGridViewAdvancedCellBorderStyle.InsetDouble: 
                            dgvabs = new DataGridViewAdvancedBorderStyle(); 
                            if (this.RightToLeftInternal)
                            { 
                                dgvabs.LeftInternal = DataGridViewAdvancedCellBorderStyle.Inset;
                            }
                            else
                            { 
                                dgvabs.LeftInternal = DataGridViewAdvancedCellBorderStyle.InsetDouble;
                            } 
                            dgvabs.RightInternal = DataGridViewAdvancedCellBorderStyle.Inset; 
                            dgvabs.TopInternal = DataGridViewAdvancedCellBorderStyle.InsetDouble;
                            dgvabs.BottomInternal = DataGridViewAdvancedCellBorderStyle.Inset; 
                            break;

                        case DataGridViewAdvancedCellBorderStyle.NotSet:
                            // Since the row headers are visible, we should make sure 
                            // that there is a left/right border for the TopLeftHeaderCell no matter what.
                            if ((!this.RightToLeftInternal && this.AdvancedColumnHeadersBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.None) || 
                                (this.RightToLeftInternal && this.AdvancedColumnHeadersBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.None)) 
                            {
                                dgvabs = new DataGridViewAdvancedBorderStyle(); 
                                if (this.RightToLeftInternal)
                                {
                                    dgvabs.LeftInternal = this.AdvancedColumnHeadersBorderStyle.Left;
                                    dgvabs.RightInternal = this.AdvancedRowHeadersBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.OutsetDouble ? 
                                        DataGridViewAdvancedCellBorderStyle.Outset : this.AdvancedRowHeadersBorderStyle.Right;
                                } 
                                else 
                                {
                                    dgvabs.LeftInternal = this.AdvancedRowHeadersBorderStyle.Left; 
                                    dgvabs.RightInternal = this.AdvancedColumnHeadersBorderStyle.Right;
                                }
                                dgvabs.TopInternal = this.AdvancedColumnHeadersBorderStyle.Top;
                                dgvabs.BottomInternal = this.AdvancedColumnHeadersBorderStyle.Bottom; 
                            }
                            else 
                            { 
                                dgvabs = this.AdvancedColumnHeadersBorderStyle;
                            } 
                            break;

                        default:
                            dgvabs = this.AdvancedColumnHeadersBorderStyle; 
                            break;
                    } 
                } 
                else
                { 
                    switch (this.AdvancedColumnHeadersBorderStyle.All)
                    {
                        case DataGridViewAdvancedCellBorderStyle.OutsetDouble:
                        case DataGridViewAdvancedCellBorderStyle.OutsetPartial: 
                            dgvabs = new DataGridViewAdvancedBorderStyle();
                            dgvabs.LeftInternal = this.RightToLeftInternal ? DataGridViewAdvancedCellBorderStyle.Outset : DataGridViewAdvancedCellBorderStyle.OutsetDouble; 
                            dgvabs.RightInternal = this.RightToLeftInternal ? DataGridViewAdvancedCellBorderStyle.OutsetDouble : DataGridViewAdvancedCellBorderStyle.Outset; 
                            dgvabs.TopInternal = DataGridViewAdvancedCellBorderStyle.OutsetDouble;
                            dgvabs.BottomInternal = DataGridViewAdvancedCellBorderStyle.Outset; 
                            break;

                        case DataGridViewAdvancedCellBorderStyle.InsetDouble:
                            dgvabs = new DataGridViewAdvancedBorderStyle(); 
                            dgvabs.LeftInternal = this.RightToLeftInternal ? DataGridViewAdvancedCellBorderStyle.Inset : DataGridViewAdvancedCellBorderStyle.InsetDouble;
                            dgvabs.RightInternal = this.RightToLeftInternal ? DataGridViewAdvancedCellBorderStyle.InsetDouble : DataGridViewAdvancedCellBorderStyle.Inset; 
                            dgvabs.TopInternal = DataGridViewAdvancedCellBorderStyle.InsetDouble; 
                            dgvabs.BottomInternal = DataGridViewAdvancedCellBorderStyle.Inset;
                            break; 

                        case DataGridViewAdvancedCellBorderStyle.NotSet:
                            // Since the row headers are visible, we should make sure
                            // that there is a left/right border for the TopLeftHeaderCell no matter what. 
                            if ((!this.RightToLeftInternal && this.AdvancedColumnHeadersBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.None) ||
                                (this.RightToLeftInternal && this.AdvancedColumnHeadersBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.None)) 
                            { 
                                dgvabs = new DataGridViewAdvancedBorderStyle();
                                if (this.RightToLeftInternal) 
                                {
                                    dgvabs.LeftInternal = this.AdvancedColumnHeadersBorderStyle.Left;
                                    dgvabs.RightInternal = this.AdvancedRowHeadersBorderStyle.Right;
                                } 
                                else
                                { 
                                    dgvabs.LeftInternal = this.AdvancedRowHeadersBorderStyle.Left; 
                                    dgvabs.RightInternal = this.AdvancedColumnHeadersBorderStyle.Right;
                                } 
                                dgvabs.TopInternal = this.AdvancedColumnHeadersBorderStyle.Top;
                                dgvabs.BottomInternal = this.AdvancedColumnHeadersBorderStyle.Bottom;
                            }
                            else 
                            {
                                dgvabs = this.AdvancedColumnHeadersBorderStyle; 
                            } 
                            break;
 
                        default:
                            dgvabs = this.AdvancedColumnHeadersBorderStyle;
                            break;
                    } 
                }
                return dgvabs; 
            } 
        }
 
        /// 
        [
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ]
        public DataGridViewAdvancedBorderStyle AdvancedCellBorderStyle 
        { 
            get
            { 
                return this.advancedCellBorderStyle;
            }
        }
 
        /// 
        [ 
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced)
        ] 
        public DataGridViewAdvancedBorderStyle AdvancedColumnHeadersBorderStyle
        {
            get
            { 
                return this.advancedColumnHeadersBorderStyle;
            } 
        } 

        ///  
        [
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Advanced)
        ] 
        public DataGridViewAdvancedBorderStyle AdvancedRowHeadersBorderStyle
        { 
            get 
            {
                return this.advancedRowHeadersBorderStyle; 
            }
        }

        ///  
        [
            DefaultValue(true), 
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_AllowUserToAddRowsDescr)
        ] 
        public bool AllowUserToAddRows
        {
            get
            { 
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_allowUserToAddRows];
            } 
            set 
            {
                if (this.AllowUserToAddRows != value) 
                {
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_allowUserToAddRows] = value;
                    if (this.DataSource != null)
                    { 
                        this.dataConnection.ResetCachedAllowUserToAddRowsInternal();
                    } 
                    OnAllowUserToAddRowsChanged(EventArgs.Empty); 
                }
            } 
        }

        internal bool AllowUserToAddRowsInternal
        { 
            get
            { 
                if (this.DataSource == null) 
                {
                    return this.AllowUserToAddRows; 
                }
                else
                {
                    return this.AllowUserToAddRows && this.dataConnection.AllowAdd; 
                }
            } 
        } 

        ///  
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewOnAllowUserToAddRowsChangedDescr)
        ] 
        public event EventHandler AllowUserToAddRowsChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWALLOWUSERTOADDROWSCHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWALLOWUSERTOADDROWSCHANGED, value); 
            }
        } 
 
        /// 
        [ 
            DefaultValue(true),
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_AllowUserToDeleteRowsDescr)
        ] 
        public bool AllowUserToDeleteRows
        { 
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_allowUserToDeleteRows]; 
            }
            set
            {
                if (this.AllowUserToDeleteRows != value) 
                {
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_allowUserToDeleteRows] = value; 
                    OnAllowUserToDeleteRowsChanged(EventArgs.Empty); 
                }
            } 
        }

        internal bool AllowUserToDeleteRowsInternal
        { 
            get
            { 
                if (this.DataSource == null) 
                {
                    return this.AllowUserToDeleteRows; 
                }
                else
                {
                    return this.AllowUserToDeleteRows && this.dataConnection.AllowRemove; 
                }
            } 
        } 

        ///  
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewOnAllowUserToDeleteRowsChangedDescr)
        ] 
        public event EventHandler AllowUserToDeleteRowsChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWALLOWUSERTODELETEROWSCHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWALLOWUSERTODELETEROWSCHANGED, value); 
            }
        } 
 
        /// 
        [ 
            DefaultValue(false),
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_AllowUserToOrderColumnsDescr)
        ] 
        public bool AllowUserToOrderColumns
        { 
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_allowUserToOrderColumns]; 
            }
            set
            {
                if (this.AllowUserToOrderColumns != value) 
                {
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_allowUserToOrderColumns] = value; 
                    OnAllowUserToOrderColumnsChanged(EventArgs.Empty); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewOnAllowUserToOrderColumnsChangedDescr) 
        ] 
        public event EventHandler AllowUserToOrderColumnsChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWALLOWUSERTOORDERCOLUMNSCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWALLOWUSERTOORDERCOLUMNSCHANGED, value); 
            }
        } 

        /// 
        /// 
        ///     
        ///       Gets or sets a global value indicating if the dataGridView's columns are resizable with the mouse.
        ///       The resizable aspect of a column can be overridden by DataGridViewColumn.Resizable. 
        ///     
        /// 
        [ 
            DefaultValue(true),
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_AllowUserToResizeColumnsDescr)
        ] 
        public bool AllowUserToResizeColumns
        { 
            get 
            {
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_allowUserToResizeColumns]; 
            }
            set
            {
                if (this.AllowUserToResizeColumns != value) 
                {
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_allowUserToResizeColumns] = value; 
                    OnAllowUserToResizeColumnsChanged(EventArgs.Empty); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewOnAllowUserToResizeColumnsChangedDescr) 
        ] 
        public event EventHandler AllowUserToResizeColumnsChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWALLOWUSERTORESIZECOLUMNSCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWALLOWUSERTORESIZECOLUMNSCHANGED, value); 
            }
        } 

        /// 
        /// 
        ///     
        ///       Gets or sets a global value indicating if the dataGridView's rows are resizable with the mouse.
        ///       The resizable aspect of a row can be overridden by DataGridViewRow.Resizable. 
        ///     
        /// 
        [ 
            DefaultValue(true),
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_AllowUserToResizeRowsDescr)
        ] 
        public bool AllowUserToResizeRows
        { 
            get 
            {
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_allowUserToResizeRows]; 
            }
            set
            {
                if (this.AllowUserToResizeRows != value) 
                {
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_allowUserToResizeRows] = value; 
                    OnAllowUserToResizeRowsChanged(EventArgs.Empty); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewOnAllowUserToResizeRowsChangedDescr) 
        ] 
        public event EventHandler AllowUserToResizeRowsChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWALLOWUSERTORESIZEROWSCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWALLOWUSERTORESIZEROWSCHANGED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_AlternatingRowsDefaultCellStyleDescr)
        ] 
        public DataGridViewCellStyle AlternatingRowsDefaultCellStyle 
        {
            get 
            {
                if (this.alternatingRowsDefaultCellStyle == null)
                {
                    this.alternatingRowsDefaultCellStyle = new DataGridViewCellStyle(); 
                    this.alternatingRowsDefaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.AlternatingRows);
                } 
                return this.alternatingRowsDefaultCellStyle; 
            }
            set 
            {
                DataGridViewCellStyle cs = this.AlternatingRowsDefaultCellStyle;
                cs.RemoveScope(DataGridViewCellStyleScopes.AlternatingRows);
                this.alternatingRowsDefaultCellStyle = value; 
                if (value != null)
                { 
                    this.alternatingRowsDefaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.AlternatingRows); 
                }
                DataGridViewCellStyleDifferences dgvcsc = cs.GetDifferencesFrom(this.AlternatingRowsDefaultCellStyle); 
                if (dgvcsc != DataGridViewCellStyleDifferences.None)
                {
                    this.CellStyleChangedEventArgs.ChangeAffectsPreferredSize = (dgvcsc == DataGridViewCellStyleDifferences.AffectPreferredSize);
                    OnAlternatingRowsDefaultCellStyleChanged(this.CellStyleChangedEventArgs); 
                }
            } 
        } 

        ///  
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewAlternatingRowsDefaultCellStyleChangedDescr)
        ] 
        public event EventHandler AlternatingRowsDefaultCellStyleChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWALTERNATINGROWSDEFAULTCELLSTYLECHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWALTERNATINGROWSDEFAULTCELLSTYLECHANGED, value); 
            }
        } 
 
        internal bool ApplyVisualStylesToInnerCells
        { 
            get
            {
                return Application.RenderWithVisualStyles;
            } 
        }
 
        internal bool ApplyVisualStylesToHeaderCells 
        {
            get 
            {
                return Application.RenderWithVisualStyles && this.EnableHeadersVisualStyles;
            }
        } 

        ///  
        ///  
        ///    
        ///     
        /// 
        [
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            DefaultValue(true)
        ] 
        public bool AutoGenerateColumns 
        {
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_autoGenerateColumns];
            }
            set{ 
                if (this.dataGridViewState1[DATAGRIDVIEWSTATE1_autoGenerateColumns] != value)
                { 
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_autoGenerateColumns] = value; 
                    OnAutoGenerateColumnsChanged(EventArgs.Empty);
                } 
            }
        }

        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ]
        public event EventHandler AutoGenerateColumnsChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWAUTOGENERATECOLUMNSCHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWAUTOGENERATECOLUMNSCHANGED, value);
            } 
        }

        /// 
        ///  
        ///     Overriding base implementation for perf gains. 
        ///  
        public override bool AutoSize 
        {
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_isAutoSized];
            }
            set 
            {
                base.AutoSize = value; 
                this.dataGridViewState1[DATAGRIDVIEWSTATE1_isAutoSized] = value; 
            }
        } 

        /// 
        /// 
        ///     Gets or sets the columns' autosizing mode. Standard inheritance model is used: 
        ///           Columns with AutoSizeMode property set to NotSet will use this auto size mode.
        ///     
        ///  
        [
            DefaultValue(DataGridViewAutoSizeColumnsMode.None), 
            SRCategory(SR.CatLayout),
            SRDescription(SR.DataGridView_AutoSizeColumnsModeDescr)
        ]
        public DataGridViewAutoSizeColumnsMode AutoSizeColumnsMode 
        {
            get 
            { 
                return this.autoSizeColumnsMode;
            } 

            set
            {
                switch (value) 
                {
                    case DataGridViewAutoSizeColumnsMode.None: 
                    case DataGridViewAutoSizeColumnsMode.ColumnHeader: 
                    case DataGridViewAutoSizeColumnsMode.AllCellsExceptHeader:
                    case DataGridViewAutoSizeColumnsMode.AllCells: 
                    case DataGridViewAutoSizeColumnsMode.DisplayedCellsExceptHeader:
                    case DataGridViewAutoSizeColumnsMode.DisplayedCells:
                    case DataGridViewAutoSizeColumnsMode.Fill:
                        break; 
                    default:
                        throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewAutoSizeColumnsMode)); 
                 } 

 
                if (this.autoSizeColumnsMode != value)
                {
                    foreach (DataGridViewColumn dataGridViewColumn in this.Columns)
                    { 
                        if (dataGridViewColumn.AutoSizeMode == DataGridViewAutoSizeColumnMode.NotSet && dataGridViewColumn.Visible)
                        { 
                            // Make sure there is no visible column which would have an inherited autosize mode based on the header only. 
                            if (value == DataGridViewAutoSizeColumnsMode.ColumnHeader && !this.ColumnHeadersVisible)
                            { 
                                throw new InvalidOperationException(SR.GetString(SR.DataGridView_CannotAutoSizeColumnsInvisibleColumnHeaders));
                            }
                            // Make sure there is no visible frozen column which would have a Fill inherited autosize mode.
                            if (value == DataGridViewAutoSizeColumnsMode.Fill && dataGridViewColumn.Frozen) 
                            {
                                throw new InvalidOperationException(SR.GetString(SR.DataGridView_CannotAutoFillFrozenColumns)); 
                            } 
                        }
                    } 
                    DataGridViewAutoSizeColumnMode[] previousModes = new DataGridViewAutoSizeColumnMode[this.Columns.Count];
                    foreach (DataGridViewColumn dataGridViewColumn in this.Columns)
                    {
                        /*DataGridViewAutoSizeColumnMode previousInheritedMode = dataGridViewColumn.InheritedAutoSizeMode; 
                        bool previousInheritedModeAutoSized = previousInheritedMode != DataGridViewAutoSizeColumnMode.Fill &&
                                                              previousInheritedMode != DataGridViewAutoSizeColumnMode.None && 
                                                              previousInheritedMode != DataGridViewAutoSizeColumnMode.NotSet;*/ 
                        previousModes[dataGridViewColumn.Index] = dataGridViewColumn.InheritedAutoSizeMode;
                    } 
                    DataGridViewAutoSizeColumnsModeEventArgs dgvcasme = new DataGridViewAutoSizeColumnsModeEventArgs(previousModes);
                    this.autoSizeColumnsMode = value;
                    OnAutoSizeColumnsModeChanged(dgvcasme);
                } 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewAutoSizeColumnsModeChangedDescr)
        ]
        public event DataGridViewAutoSizeColumnsModeEventHandler AutoSizeColumnsModeChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWAUTOSIZECOLUMNSMODECHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWAUTOSIZECOLUMNSMODECHANGED, value);
            } 
        }
 
        ///  
        /// 
        ///     Gets or sets the rows' autosizing mode.  
        /// 
        [
            DefaultValue(DataGridViewAutoSizeRowsMode.None),
            SRCategory(SR.CatLayout), 
            SRDescription(SR.DataGridView_AutoSizeRowsModeDescr)
        ] 
        public DataGridViewAutoSizeRowsMode AutoSizeRowsMode 
        {
            get 
            {
                return this.autoSizeRowsMode;
            }
            set 
            {
                switch (value) 
                { 
                   case DataGridViewAutoSizeRowsMode.None:
                   case DataGridViewAutoSizeRowsMode.AllHeaders: 
                   case DataGridViewAutoSizeRowsMode.AllCellsExceptHeaders:
                   case DataGridViewAutoSizeRowsMode.AllCells:
                   case DataGridViewAutoSizeRowsMode.DisplayedHeaders:
                   case DataGridViewAutoSizeRowsMode.DisplayedCellsExceptHeaders: 
                   case DataGridViewAutoSizeRowsMode.DisplayedCells:
                       break; 
                   default: 
                       throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewAutoSizeRowsMode));
                } 
                if ((value == DataGridViewAutoSizeRowsMode.AllHeaders || value == DataGridViewAutoSizeRowsMode.DisplayedHeaders) &&
                    !this.RowHeadersVisible)
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_CannotAutoSizeRowsInvisibleRowHeader)); 
                }
                if (this.autoSizeRowsMode != value) 
                { 
                    DataGridViewAutoSizeModeEventArgs dgvasme = new DataGridViewAutoSizeModeEventArgs(this.autoSizeRowsMode != DataGridViewAutoSizeRowsMode.None);
                    this.autoSizeRowsMode = value; 
                    OnAutoSizeRowsModeChanged(dgvasme);
                }
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewAutoSizeRowsModeChangedDescr) 
        ]
        public event DataGridViewAutoSizeModeEventHandler AutoSizeRowsModeChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWAUTOSIZEROWSMODECHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWAUTOSIZEROWSMODECHANGED, value);
            }
        }
 
        /// 
        ///  
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Never), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ]
        public override Color BackColor
        { 
            get
            { 
                return base.BackColor; 
            }
            set 
            {
                base.BackColor = value;
            }
        } 

        ///  
        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Never)
        ]
        new public event EventHandler BackColorChanged
        { 
            add
            { 
                base.BackColorChanged += value; 
            }
            remove 
            {
                base.BackColorChanged -= value;
            }
        } 

        internal SolidBrush BackgroundBrush 
        { 
            get
            { 
                return this.backgroundBrush;
            }
        }
 
        /// 
        ///  
        ///    Gets or sets the background color of the dataGridView. 
        /// 
        [ 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridViewBackgroundColorDescr)
        ]
        public Color BackgroundColor 
        {
            get 
            { 
                return this.backgroundBrush.Color;
            } 
            set
            {
                if (value.IsEmpty)
                { 
                    throw new ArgumentException(SR.GetString(SR.DataGridView_EmptyColor, "BackgroundColor"));
                } 
                if (value.A < 255) 
                {
                    throw new ArgumentException(SR.GetString(SR.DataGridView_TransparentColor, "BackgroundColor")); 
                }
                if (!value.Equals(this.backgroundBrush.Color))
                {
                    this.backgroundBrush = new SolidBrush(value); 
                    OnBackgroundColorChanged(EventArgs.Empty);
                } 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewBackgroundColorChangedDescr) 
        ]
        public event EventHandler BackgroundColorChanged 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWBACKGROUNDCOLORCHANGED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWBACKGROUNDCOLORCHANGED, value);
            } 
        } 

        ///  
        [
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Never)
        ] 
        public override Image BackgroundImage
        { 
            get 
            {
                return base.BackgroundImage; 
            }
            set
            {
                base.BackgroundImage = value; 
            }
        } 
 
        /// 
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Never)
        ]
        public override ImageLayout BackgroundImageLayout 
        {
            get 
            { 
                return base.BackgroundImageLayout;
            } 
            set
            {
                base.BackgroundImageLayout = value;
            } 
        }
 
        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Never)
        ]
        new public event EventHandler BackgroundImageChanged
        { 
            add
            { 
                base.BackgroundImageChanged += value; 
            }
            remove 
            {
                base.BackgroundImageChanged -= value;
            }
        } 

        ///  
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Never) 
        ]
        new public event EventHandler BackgroundImageLayoutChanged
        {
            add 
            {
                base.BackgroundImageLayoutChanged += value; 
            } 
            remove
            { 
                base.BackgroundImageLayoutChanged -= value;
            }
        }
 
        /// 
        private bool ShouldSerializeBackgroundColor() 
        { 
            return !this.BackgroundColor.Equals(DefaultBackgroundBrush.Color);
        } 

        /// 
        [
            DefaultValue(BorderStyle.FixedSingle), 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_BorderStyleDescr) 
        ] 
        public BorderStyle BorderStyle
        { 
            get
            {
                return this.borderStyle;
            } 
            set
            { 
                // Sequential enum.  Valid values are 0x0 to 0x2 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)BorderStyle.None, (int)BorderStyle.Fixed3D)){
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(BorderStyle)); 
                }
                if (this.borderStyle != value)
                {
                    using (LayoutTransaction.CreateTransactionIf(this.AutoSize, this.ParentInternal, this, PropertyNames.BorderStyle)) 
                    {
                        this.borderStyle = value; 
                        if (!this.AutoSize) 
                        {
                            PerformLayoutPrivate(false /*useRowShortcut*/, false /*computeVisibleRows*/, true /*invalidInAdjustFillingColumns*/, true /*repositionEditingControl*/); 
                        }
                        Invalidate();
                        OnBorderStyleChanged(EventArgs.Empty);
                    } 
                }
            } 
        } 

        ///  
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewBorderStyleChangedDescr)
        ] 
        public event EventHandler BorderStyleChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWBORDERSTYLECHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWBORDERSTYLECHANGED, value); 
            }
        } 
 
        private int BorderWidth
        { 
            get
            {
                if (this.BorderStyle == BorderStyle.Fixed3D)
                { 
                    return Application.RenderWithVisualStyles ? 1 : SystemInformation.Border3DSize.Width;
                } 
                else if (this.BorderStyle == BorderStyle.FixedSingle) 
                {
                    return 1; 
                }
                else
                {
                    return 0; 
                }
            } 
        } 

        internal Graphics CachedGraphics 
        {
            get
            {
                if (this.cachedGraphics == null) 
                {
                    this.cachedGraphics = WindowsFormsUtils.CreateMeasurementGraphics(); 
                } 
                return this.cachedGraphics;
            } 
        }

        // Ime can be shown when there is a read-write current cell.
        protected override bool CanEnableIme 
        {
            get 
            { 
                bool canEnable = false;
 
                Debug.WriteLineIf( CompModSwitches.ImeMode.Level >= TraceLevel.Info, "Inside get_CanEnableIme(), this = " + this );
                Debug.Indent();

                if (this.ptCurrentCell.X != -1 /*&& !this.IsCurrentCellInEditMode*/ && ColumnEditable(this.ptCurrentCell.X)) 
                {
                    DataGridViewCell dataGridViewCell = this.CurrentCellInternal; 
                    Debug.Assert(dataGridViewCell != null); 

                    if (!IsSharedCellReadOnly(dataGridViewCell, this.ptCurrentCell.Y)) 
                    {
                        canEnable = base.CanEnableIme;
                    }
                } 

                Debug.WriteLineIf( CompModSwitches.ImeMode.Level >= TraceLevel.Info, "Value = " + canEnable ); 
                Debug.Unindent(); 

                return canEnable; 
            }
        }

        ///  
        [
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_CellBorderStyleDescr), 
            Browsable(true),
            DefaultValue(DataGridViewCellBorderStyle.Single) 
        ]
        public DataGridViewCellBorderStyle CellBorderStyle
        {
            get 
            {
                switch (this.advancedCellBorderStyle.All) 
                { 
                    case DataGridViewAdvancedCellBorderStyle.NotSet:
                        if (this.advancedCellBorderStyle.Top == DataGridViewAdvancedCellBorderStyle.None && 
                            this.advancedCellBorderStyle.Bottom == DataGridViewAdvancedCellBorderStyle.None)
                        {
                            if (this.RightToLeftInternal)
                            { 
                                if (this.advancedCellBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.None &&
                                    this.advancedCellBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.Single) 
                                { 
                                    return DataGridViewCellBorderStyle.SingleVertical;
                                } 
                            }
                            else
                            {
                                if (this.advancedCellBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.None && 
                                    this.advancedCellBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.Single)
                                { 
                                    return DataGridViewCellBorderStyle.SingleVertical; 
                                }
                            } 
                            if (this.advancedCellBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.Outset &&
                                this.advancedCellBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.Outset)
                            {
                                return DataGridViewCellBorderStyle.RaisedVertical; 
                            }
                            if (this.advancedCellBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.Inset && 
                                this.advancedCellBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.Inset) 
                            {
                                return DataGridViewCellBorderStyle.SunkenVertical; 
                            }
                        }
                        if (this.advancedCellBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.None &&
                            this.advancedCellBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.None) 
                        {
                            if (this.advancedCellBorderStyle.Top == DataGridViewAdvancedCellBorderStyle.None && 
                                this.advancedCellBorderStyle.Bottom == DataGridViewAdvancedCellBorderStyle.Single) 
                            {
                                return DataGridViewCellBorderStyle.SingleHorizontal; 
                            }
                            if (this.advancedCellBorderStyle.Top == DataGridViewAdvancedCellBorderStyle.Outset &&
                                this.advancedCellBorderStyle.Bottom == DataGridViewAdvancedCellBorderStyle.Outset)
                            { 
                                return DataGridViewCellBorderStyle.RaisedHorizontal;
                            } 
                            if (this.advancedCellBorderStyle.Top == DataGridViewAdvancedCellBorderStyle.Inset && 
                                this.advancedCellBorderStyle.Bottom == DataGridViewAdvancedCellBorderStyle.Inset)
                            { 
                                return DataGridViewCellBorderStyle.SunkenHorizontal;
                            }
                        }
                        return DataGridViewCellBorderStyle.Custom; 

                    case DataGridViewAdvancedCellBorderStyle.None: 
                        return DataGridViewCellBorderStyle.None; 

                    case DataGridViewAdvancedCellBorderStyle.Single: 
                        return DataGridViewCellBorderStyle.Single;

                    case DataGridViewAdvancedCellBorderStyle.Inset:
                        return DataGridViewCellBorderStyle.Sunken; 

                    case DataGridViewAdvancedCellBorderStyle.Outset: 
                        return DataGridViewCellBorderStyle.Raised; 

                    default: 
                        Debug.Fail("Unexpected this.advancedCellBorderStyle.All value in CellBorderStyle.get");
                        return DataGridViewCellBorderStyle.Custom;
                }
            } 
            set
            { 
                // Sequential enum.  Valid values are 0x0 to 0xa 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewCellBorderStyle.Custom, (int)DataGridViewCellBorderStyle.SunkenHorizontal))
                { 
                     throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewCellBorderStyle));
                }

                if (value != this.CellBorderStyle) 
                {
                    if (value == DataGridViewCellBorderStyle.Custom) 
                    { 
                        throw new ArgumentException(SR.GetString(SR.DataGridView_CustomCellBorderStyleInvalid, "CellBorderStyle"));
                    } 
                    this.dataGridViewOper[DATAGRIDVIEWOPER_inBorderStyleChange] = true;
                    try
                    {
                        switch (value) 
                        {
                            case DataGridViewCellBorderStyle.Single: 
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.Single; 
                                break;
 
                            case DataGridViewCellBorderStyle.Raised:
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.Outset;
                                break;
 
                            case DataGridViewCellBorderStyle.Sunken:
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.Inset; 
                                break; 

                            case DataGridViewCellBorderStyle.None: 
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                break;

                            case DataGridViewCellBorderStyle.SingleVertical: 
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                if (this.RightToLeftInternal) 
                                { 
                                    this.advancedCellBorderStyle.LeftInternal = DataGridViewAdvancedCellBorderStyle.Single;
                                } 
                                else
                                {
                                    this.advancedCellBorderStyle.RightInternal = DataGridViewAdvancedCellBorderStyle.Single;
                                } 
                                break;
 
                            case DataGridViewCellBorderStyle.RaisedVertical: 
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                this.advancedCellBorderStyle.RightInternal = DataGridViewAdvancedCellBorderStyle.Outset; 
                                this.advancedCellBorderStyle.LeftInternal = DataGridViewAdvancedCellBorderStyle.Outset;
                                break;

                            case DataGridViewCellBorderStyle.SunkenVertical: 
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                this.advancedCellBorderStyle.RightInternal = DataGridViewAdvancedCellBorderStyle.Inset; 
                                this.advancedCellBorderStyle.LeftInternal = DataGridViewAdvancedCellBorderStyle.Inset; 
                                break;
 
                            case DataGridViewCellBorderStyle.SingleHorizontal:
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                this.advancedCellBorderStyle.BottomInternal = DataGridViewAdvancedCellBorderStyle.Single;
                                break; 

                            case DataGridViewCellBorderStyle.RaisedHorizontal: 
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None; 
                                this.advancedCellBorderStyle.TopInternal = DataGridViewAdvancedCellBorderStyle.Outset;
                                this.advancedCellBorderStyle.BottomInternal = DataGridViewAdvancedCellBorderStyle.Outset; 
                                break;

                            case DataGridViewCellBorderStyle.SunkenHorizontal:
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None; 
                                this.advancedCellBorderStyle.TopInternal = DataGridViewAdvancedCellBorderStyle.Inset;
                                this.advancedCellBorderStyle.BottomInternal = DataGridViewAdvancedCellBorderStyle.Inset; 
                                break; 
                        }
                    } 
                    finally
                    {
                        this.dataGridViewOper[DATAGRIDVIEWOPER_inBorderStyleChange] = false;
                    } 
                    OnCellBorderStyleChanged(EventArgs.Empty);
                } 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_CellBorderStyleChangedDescr) 
        ]
        public event EventHandler CellBorderStyleChanged 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLBORDERSTYLECHANGED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLBORDERSTYLECHANGED, value);
            } 
        } 

        internal bool CellMouseDownInContentBounds 
        {
            get
            {
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_cellMouseDownInContentBounds]; 
            }
            set 
            { 
                this.dataGridViewState2[DATAGRIDVIEWSTATE2_cellMouseDownInContentBounds] = value;
            } 
        }

        internal DataGridViewCellPaintingEventArgs CellPaintingEventArgs
        { 
            get
            { 
                if (this.dgvcpe == null) 
                {
                    this.dgvcpe = new DataGridViewCellPaintingEventArgs(this); 
                }
                return this.dgvcpe;
            }
        } 

        private DataGridViewCellStyleChangedEventArgs CellStyleChangedEventArgs 
        { 
            get
            { 
                if (this.dgvcsce == null)
                {
                    this.dgvcsce = new DataGridViewCellStyleChangedEventArgs();
                } 
                return this.dgvcsce;
            } 
        } 

        internal DataGridViewCellValueEventArgs CellValueEventArgs 
        {
            get
            {
                if (this.dgvcve == null) 
                {
                    this.dgvcve = new DataGridViewCellValueEventArgs(); 
                } 
                return this.dgvcve;
            } 
        }

        /// 
        [ 
            Browsable(true),
            DefaultValue(DataGridViewClipboardCopyMode.EnableWithAutoHeaderText), 
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_ClipboardCopyModeDescr)
        ] 
        public DataGridViewClipboardCopyMode ClipboardCopyMode
        {
            get
            { 
                return this.clipboardCopyMode;
            } 
            set 
            {
                // Sequential enum.  Valid values are 0x0 to 0x3 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewClipboardCopyMode.Disable, (int)DataGridViewClipboardCopyMode.EnableAlwaysIncludeHeaderText))
                {
                   throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewClipboardCopyMode));
                } 
                this.clipboardCopyMode = value;
            } 
        } 

        ///  
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
            DefaultValue(0), 
            EditorBrowsable(EditorBrowsableState.Advanced)
        ] 
        public int ColumnCount 
        {
            get 
            {
                return this.Columns.Count;
            }
            set 
            {
                if (value < 0) 
                { 
                    throw new ArgumentOutOfRangeException("ColumnCount", SR.GetString(SR.InvalidLowBoundArgumentEx, "ColumnCount", value.ToString(CultureInfo.CurrentCulture), (0).ToString(CultureInfo.CurrentCulture)));
                } 
                if (this.DataSource != null)
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_CannotSetColumnCountOnDataBoundDataGridView));
                } 
                if (value != this.Columns.Count)
                { 
                    if (value == 0) 
                    {
                        // Total removal of the columns. This also clears the rows. 
                        this.Columns.Clear();
                    }
                    else if (value < this.Columns.Count)
                    { 
                        // Some columns need to be removed, from the tail of the columns collection
                        while (value < this.Columns.Count) 
                        { 
                            int currentColumnCount = this.Columns.Count;
                            this.Columns.RemoveAt(currentColumnCount - 1); 
                            if (this.Columns.Count >= currentColumnCount)
                            {
                                // Column removal failed. We stop the loop.
                                break; 
                            }
                        } 
                    } 
                    else
                    { 
                        // Some DataGridViewTextBoxColumn columns need to be appened.
                        while (value > this.Columns.Count)
                        {
                            int currentColumnCount = this.Columns.Count; 
                            this.Columns.Add(null /*columnName*/, null /*headerText*/);
                            if (this.Columns.Count <= currentColumnCount) 
                            { 
                                // Column addition failed. We stop the loop.
                                break; 
                            }
                        }
                    }
                } 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_ColumnHeadersBorderStyleDescr),
            Browsable(true),
            DefaultValue(DataGridViewHeaderBorderStyle.Raised) 
        ]
        public DataGridViewHeaderBorderStyle ColumnHeadersBorderStyle 
        { 
            get
            { 
                switch (this.advancedColumnHeadersBorderStyle.All)
                {
                    case DataGridViewAdvancedCellBorderStyle.NotSet:
                        return DataGridViewHeaderBorderStyle.Custom; 

                    case DataGridViewAdvancedCellBorderStyle.None: 
                        return DataGridViewHeaderBorderStyle.None; 

                    case DataGridViewAdvancedCellBorderStyle.Single: 
                        return DataGridViewHeaderBorderStyle.Single;

                    case DataGridViewAdvancedCellBorderStyle.InsetDouble:
                        return DataGridViewHeaderBorderStyle.Sunken; 

                    case DataGridViewAdvancedCellBorderStyle.OutsetPartial: 
                        return DataGridViewHeaderBorderStyle.Raised; 

                    default: 
                        return DataGridViewHeaderBorderStyle.Custom;
                }
            }
            set 
            {
                // Sequential enum.  Valid values are 0x0 to 0x4 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewHeaderBorderStyle.Custom, (int)DataGridViewHeaderBorderStyle.None)) 
                {
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewHeaderBorderStyle)); 
                }
                if (value != this.ColumnHeadersBorderStyle)
                {
                    if (value == DataGridViewHeaderBorderStyle.Custom) 
                    {
                        throw new ArgumentException(SR.GetString(SR.DataGridView_CustomCellBorderStyleInvalid, "ColumnHeadersBorderStyle")); 
                    } 
                    this.dataGridViewOper[DATAGRIDVIEWOPER_inBorderStyleChange] = true;
                    try 
                    {
                        switch (value)
                        {
                            case DataGridViewHeaderBorderStyle.Single: 
                                this.advancedColumnHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.Single;
                                break; 
 
                            case DataGridViewHeaderBorderStyle.Raised:
                                this.advancedColumnHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.OutsetPartial; 
                                break;

                            case DataGridViewHeaderBorderStyle.Sunken:
                                this.advancedColumnHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.InsetDouble; 
                                break;
 
                            case DataGridViewHeaderBorderStyle.None: 
                                this.advancedColumnHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                break; 
                        }
                    }
                    finally
                    { 
                        this.dataGridViewOper[DATAGRIDVIEWOPER_inBorderStyleChange] = false;
                    } 
                    OnColumnHeadersBorderStyleChanged(EventArgs.Empty); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnHeadersBorderStyleChangedDescr) 
        ] 
        public event EventHandler ColumnHeadersBorderStyleChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSBORDERSTYLECHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSBORDERSTYLECHANGED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_ColumnHeadersDefaultCellStyleDescr),
            AmbientValue(null) 
        ] 
        public DataGridViewCellStyle ColumnHeadersDefaultCellStyle
        { 
            get
            {
                if (this.columnHeadersDefaultCellStyle == null)
                { 
                    this.columnHeadersDefaultCellStyle = this.DefaultColumnHeadersDefaultCellStyle;
                } 
                return this.columnHeadersDefaultCellStyle; 
            }
            set 
            {
                DataGridViewCellStyle cs = this.ColumnHeadersDefaultCellStyle;
                cs.RemoveScope(DataGridViewCellStyleScopes.ColumnHeaders);
                this.columnHeadersDefaultCellStyle = value; 
                if (value != null)
                { 
                    this.columnHeadersDefaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.ColumnHeaders); 
                }
                DataGridViewCellStyleDifferences dgvcsc = cs.GetDifferencesFrom(this.ColumnHeadersDefaultCellStyle); 
                if (dgvcsc != DataGridViewCellStyleDifferences.None)
                {
                    this.CellStyleChangedEventArgs.ChangeAffectsPreferredSize = (dgvcsc == DataGridViewCellStyleDifferences.AffectPreferredSize);
                    OnColumnHeadersDefaultCellStyleChanged(this.CellStyleChangedEventArgs); 
                }
            } 
        } 

        private DataGridViewCellStyle DefaultColumnHeadersDefaultCellStyle { 
            get
            {
                DataGridViewCellStyle defaultStyle = new DataGridViewCellStyle();
                defaultStyle.BackColor = DefaultHeadersBackBrush.Color; 
                defaultStyle.ForeColor = DefaultForeBrush.Color;
                defaultStyle.SelectionBackColor = DefaultSelectionBackBrush.Color; 
                defaultStyle.SelectionForeColor = DefaultSelectionForeBrush.Color; 
                defaultStyle.Font = base.Font;
                defaultStyle.AlignmentInternal = DataGridViewContentAlignment.MiddleLeft; 
                defaultStyle.WrapModeInternal = DataGridViewTriState.True;
                defaultStyle.AddScope(this, DataGridViewCellStyleScopes.ColumnHeaders);

                this.dataGridViewState1[DATAGRIDVIEWSTATE1_ambientColumnHeadersFont] = true; 

                return defaultStyle; 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewColumnHeadersDefaultCellStyleChangedDescr) 
        ]
        public event EventHandler ColumnHeadersDefaultCellStyleChanged 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSDEFAULTCELLSTYLECHANGED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSDEFAULTCELLSTYLECHANGED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatAppearance),
            Localizable(true),
            SRDescription(SR.DataGridView_ColumnHeadersHeightDescr) 
        ]
        public int ColumnHeadersHeight 
        { 
            get
            { 
                return this.columnHeadersHeight;
            }
            set
            { 
                if (value < minimumColumnHeadersHeight)
                { 
                    throw new ArgumentOutOfRangeException("ColumnHeadersHeight", SR.GetString(SR.InvalidLowBoundArgumentEx, "ColumnHeadersHeight", (value).ToString(CultureInfo.CurrentCulture), (minimumColumnHeadersHeight).ToString(CultureInfo.CurrentCulture))); 
                }
                if (value > maxHeadersThickness) 
                {
                    throw new ArgumentOutOfRangeException("ColumnHeadersHeight", SR.GetString(SR.InvalidHighBoundArgumentEx, "ColumnHeadersHeight", (value).ToString(CultureInfo.CurrentCulture), (maxHeadersThickness).ToString(CultureInfo.CurrentCulture)));
                }
                if (this.ColumnHeadersHeightSizeMode == DataGridViewColumnHeadersHeightSizeMode.AutoSize) 
                {
                    this.cachedColumnHeadersHeight = value; 
                } 
                else if (this.columnHeadersHeight != value)
                { 
                    SetColumnHeadersHeightInternal(value, true /*invalidInAdjustFillingColumns*/);
                }
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewColumnHeadersHeightChangedDescr) 
        ]
        public event EventHandler ColumnHeadersHeightChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSHEIGHTCHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSHEIGHTCHANGED, value);
            }
        }
 
        private bool ShouldSerializeColumnHeadersHeight()
        { 
            return this.ColumnHeadersHeightSizeMode != DataGridViewColumnHeadersHeightSizeMode.AutoSize && defaultColumnHeadersHeight != this.ColumnHeadersHeight; 
        }
 
        /// 
        /// 
        ///    
        ///       Gets or sets a value that determines the behavior for adjusting the column headers height. 
        ///    
        ///  
        [ 
            DefaultValue(DataGridViewColumnHeadersHeightSizeMode.EnableResizing),
            RefreshProperties(RefreshProperties.All), 
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_ColumnHeadersHeightSizeModeDescr)
        ]
        public DataGridViewColumnHeadersHeightSizeMode ColumnHeadersHeightSizeMode 
        {
            get 
            { 
                return this.columnHeadersHeightSizeMode;
            } 
            set
            {
               // Sequential enum.  Valid values are 0x0 to 0x2
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewColumnHeadersHeightSizeMode.EnableResizing, (int)DataGridViewColumnHeadersHeightSizeMode.AutoSize)) 
                {
                     throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewColumnHeadersHeightSizeMode)); 
                } 
                if (this.columnHeadersHeightSizeMode != value)
                { 
                    /*if (value == DataGridViewColumnHeadersHeightSizeMode.AutoSize && !this.ColumnHeadersVisible)
                    {
                        We intentionally don't throw an error because of designer code spit order.
                    }*/ 
                    DataGridViewAutoSizeModeEventArgs dgvasme = new DataGridViewAutoSizeModeEventArgs(this.columnHeadersHeightSizeMode == DataGridViewColumnHeadersHeightSizeMode.AutoSize);
                    this.columnHeadersHeightSizeMode = value; 
                    OnColumnHeadersHeightSizeModeChanged(dgvasme); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnHeadersHeightSizeModeChangedDescr) 
        ] 
        public event DataGridViewAutoSizeModeEventHandler ColumnHeadersHeightSizeModeChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSHEIGHTSIZEMODECHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSHEIGHTSIZEMODECHANGED, value); 
            }
        } 

        /// 
        /// 
        ///     
        ///       Gets
        ///       or sets a value indicating if the dataGridView's column headers are visible. 
        ///     
        /// 
        [ 
            SRCategory(SR.CatAppearance),
            DefaultValue(true),
            SRDescription(SR.DataGridViewColumnHeadersVisibleDescr)
        ] 
        public bool ColumnHeadersVisible
        { 
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_columnHeadersVisible]; 
            }
            set
            {
                if (this.ColumnHeadersVisible != value) 
                {
                    if (!value) 
                    { 
                        // Make sure that there is no visible column that only counts on the column headers to autosize
                        DataGridViewColumn dataGridViewColumn = this.Columns.GetFirstColumn(DataGridViewElementStates.Visible); 
                        while (dataGridViewColumn != null)
                        {
                            if (dataGridViewColumn.InheritedAutoSizeMode == DataGridViewAutoSizeColumnMode.ColumnHeader)
                            { 
                                throw new InvalidOperationException(SR.GetString(SR.DataGridView_ColumnHeadersCannotBeInvisible));
                            } 
                            dataGridViewColumn = this.Columns.GetNextColumn(dataGridViewColumn, 
                                DataGridViewElementStates.Visible,
                                DataGridViewElementStates.None); 
                        }
                    }
                    using (LayoutTransaction.CreateTransactionIf(this.AutoSize, this.ParentInternal, this, PropertyNames.ColumnHeadersVisible))
                    { 
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_columnHeadersVisible] = value;
                        this.layout.ColumnHeadersVisible = value; 
                        this.displayedBandsInfo.EnsureDirtyState(); 
                        if (!this.AutoSize)
                        { 
                            PerformLayoutPrivate(false /*useRowShortcut*/, false /*computeVisibleRows*/, true /*invalidInAdjustFillingColumns*/, true /*repositionEditingControl*/);
                        }
                        InvalidateInside();
                        OnColumnHeadersGlobalAutoSize(); 
                    }
                } 
            } 
        }
 
        /// 
        [
            Editor("System.Windows.Forms.Design.DataGridViewColumnCollectionEditor, " + AssemblyRef.SystemDesign, typeof(System.Drawing.Design.UITypeEditor)),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Content), 
            MergableProperty(false)
        ] 
        public DataGridViewColumnCollection Columns 
        {
            get 
            {
                if (this.dataGridViewColumns == null)
                {
                    this.dataGridViewColumns = CreateColumnsInstance(); 
                }
                return this.dataGridViewColumns; 
            } 
        }
 
        /// 
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public DataGridViewCell CurrentCell 
        { 
            get
            { 
                if (this.ptCurrentCell.X == -1 && this.ptCurrentCell.Y == -1)
                {
                    return null;
                } 
                Debug.Assert(this.ptCurrentCell.X >= 0 && ptCurrentCell.Y >= 0);
                Debug.Assert(this.ptCurrentCell.X < this.Columns.Count); 
                Debug.Assert(this.ptCurrentCell.Y < this.Rows.Count); 
                DataGridViewRow dataGridViewRow = (DataGridViewRow) this.Rows[this.ptCurrentCell.Y]; // unsharing row
                return dataGridViewRow.Cells[this.ptCurrentCell.X]; 
            }
            set
            {
                if ((value != null && (value.RowIndex != this.ptCurrentCell.Y || value.ColumnIndex != this.ptCurrentCell.X)) || 
                    (value == null && this.ptCurrentCell.X != -1))
                { 
                    if (value == null) 
                    {
                        ClearSelection(); 
                        if (!SetCurrentCellAddressCore(-1, -1, true /*setAnchorCellAddress*/, true /*validateCurrentCell*/, false /*throughMouseClick*/))
                        {
                            // Edited value couldn't be committed or aborted
                            throw new InvalidOperationException(SR.GetString(SR.DataGridView_CellChangeCannotBeCommittedOrAborted)); 
                        }
                    } 
                    else 
                    {
                        if (value.DataGridView != this) 
                        {
                            throw new ArgumentException(SR.GetString(SR.DataGridView_CellDoesNotBelongToDataGridView));
                        }
                        if (!this.Columns[value.ColumnIndex].Visible || 
                            (this.Rows.GetRowState(value.RowIndex) & DataGridViewElementStates.Visible) == 0)
                        { 
                            throw new InvalidOperationException(SR.GetString(SR.DataGridView_CurrentCellCannotBeInvisible)); 
                        }
                        if (!ScrollIntoView(value.ColumnIndex, value.RowIndex, true)) 
                        {
                            throw new InvalidOperationException(SR.GetString(SR.DataGridView_CellChangeCannotBeCommittedOrAborted));
                        }
                        if (IsInnerCellOutOfBounds(value.ColumnIndex, value.RowIndex)) 
                        {
                            return; 
                        } 
                        ClearSelection(value.ColumnIndex, value.RowIndex, true /*selectExceptionElement*/);
                        if (!SetCurrentCellAddressCore(value.ColumnIndex, value.RowIndex, true, false, false)) 
                        {
                            throw new InvalidOperationException(SR.GetString(SR.DataGridView_CellChangeCannotBeCommittedOrAborted));
                        }
                    } 
                }
            } 
        } 

        ///  
        [
            Browsable(false)
        ]
        public Point CurrentCellAddress 
        {
            get 
            { 
                return this.ptCurrentCell;
            } 
        }

        private DataGridViewCell CurrentCellInternal
        { 
            get
            { 
                Debug.Assert(this.ptCurrentCell.X >= 0 && this.ptCurrentCell.X < this.Columns.Count); 
                Debug.Assert(this.ptCurrentCell.Y >= 0 && this.ptCurrentCell.Y < this.Rows.Count);
                DataGridViewRow dataGridViewRow = this.Rows.SharedRow(this.ptCurrentCell.Y); 
                Debug.Assert(dataGridViewRow != null);
                DataGridViewCell dataGridViewCell = dataGridViewRow.Cells[this.ptCurrentCell.X];
                Debug.Assert(this.IsSharedCellVisible(dataGridViewCell, this.ptCurrentCell.Y));
                return dataGridViewCell; 
            }
        } 
 
        private bool CurrentCellIsFirstVisibleCell
        { 
            get
            {
                if (this.ptCurrentCell.X == -1)
                { 
                    return false;
                } 
                Debug.Assert(this.ptCurrentCell.Y != -1); 

                bool previousVisibleColumnExists = (null != this.Columns.GetPreviousColumn(this.Columns[this.ptCurrentCell.X], DataGridViewElementStates.Visible, DataGridViewElementStates.None)); 
                bool previousVisibleRowExists = (-1 != this.Rows.GetPreviousRow(this.ptCurrentCell.Y, DataGridViewElementStates.Visible));

                return !previousVisibleColumnExists && !previousVisibleRowExists;
            } 
        }
 
        private bool CurrentCellIsLastVisibleCell 
        {
            get 
            {
                if (this.ptCurrentCell.X == -1)
                {
                    return false; 
                }
 
                Debug.Assert(this.ptCurrentCell.Y != -1); 

                bool nextVisibleColumnExists = (null != this.Columns.GetNextColumn(this.Columns[this.ptCurrentCell.X], DataGridViewElementStates.Visible, DataGridViewElementStates.None)); 
                bool nextVisibleRowExists = (-1 != this.Rows.GetNextRow(this.ptCurrentCell.Y, DataGridViewElementStates.Visible));

                return !nextVisibleColumnExists && !nextVisibleRowExists;
            } 
        }
 
        private bool CurrentCellIsEditedAndOnlySelectedCell 
        {
            get 
            {
                if (this.ptCurrentCell.X == -1)
                {
                    return false; 
                }
 
                Debug.Assert(this.ptCurrentCell.Y != -1); 

                return this.editingControl != null && 
                       GetCellCount(DataGridViewElementStates.Selected) == 1 &&
                       this.CurrentCellInternal.Selected;
            }
        } 

        ///  
        [ 
            Browsable(false)
        ] 
        public DataGridViewRow CurrentRow
        {
            get
            { 
                if (this.ptCurrentCell.X == -1)
                { 
                    return null; 
                }
 
                Debug.Assert(this.ptCurrentCell.Y >= 0);
                Debug.Assert(this.ptCurrentCell.Y < this.Rows.Count);

                return this.Rows[this.ptCurrentCell.Y]; 
            }
        } 
 
        internal Cursor CursorInternal
        { 
            set
            {
                this.dataGridViewState2[DATAGRIDVIEWSTATE2_ignoreCursorChange] = true;
                try 
                {
                    this.Cursor = value; 
                } 
                finally
                { 
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_ignoreCursorChange] = false;
                }
            }
        } 

        internal DataGridViewDataConnection DataConnection 
        { 
            get
            { 
                return this.dataConnection;
            }
        }
 
        /// 
        [ 
         DefaultValue(""), 
         SRCategory(SR.CatData),
         Editor("System.Windows.Forms.Design.DataMemberListEditor, " + AssemblyRef.SystemDesign, typeof(System.Drawing.Design.UITypeEditor)), 
         SRDescription(SR.DataGridViewDataMemberDescr)
        ]
        public string DataMember
        { 
            get
            { 
                if (this.dataConnection == null) 
                {
                    return String.Empty; 
                }
                else
                {
                    return this.dataConnection.DataMember; 
                }
            } 
            set 
            {
                if (value != this.DataMember) 
                {
                    this.CurrentCell = null;
                    if (this.dataConnection == null)
                    { 
                        this.dataConnection = new DataGridViewDataConnection(this);
                    } 
                    this.dataConnection.SetDataConnection(this.DataSource, value); 
                    OnDataMemberChanged(EventArgs.Empty);
                } 
            }
        }

        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridViewDataMemberChangedDescr) 
        ]
        public event EventHandler DataMemberChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWDATAMEMBERCHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWDATAMEMBERCHANGED, value);
            } 
        }

        /// 
        [ 
         DefaultValue(null),
         SRCategory(SR.CatData), 
         RefreshProperties(RefreshProperties.Repaint), 
         AttributeProvider(typeof(IListSource)),
         SRDescription(SR.DataGridViewDataSourceDescr) 
        ]
        public object DataSource
        {
            get 
            {
                if (this.dataConnection == null) 
                { 
                    return null;
                } 
                else
                {
                    return this.dataConnection.DataSource;
                } 
            }
            set 
            { 
                if (value != this.DataSource)
                { 
                    this.CurrentCell = null;
                    if (this.dataConnection == null)
                    {
                        this.dataConnection = new DataGridViewDataConnection(this); 
                        this.dataConnection.SetDataConnection(value, this.DataMember);
                    } 
                    else 
                    {
                        if (this.dataConnection.ShouldChangeDataMember(value)) 
                        {
                            // we fire DataMemberChanged event
                            this.DataMember = "";
                        } 
                        this.dataConnection.SetDataConnection(value, this.DataMember);
                        if (value == null) 
                        { 
                            this.dataConnection = null;
                        } 
                    }
                    OnDataSourceChanged(EventArgs.Empty);
                }
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridViewDataSourceChangedDescr)
        ]
        public event EventHandler DataSourceChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWDATASOURCECHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWDATASOURCECHANGED, value);
            }
        } 

        private static SolidBrush DefaultBackBrush 
        { 
            get
            { 
                return (SolidBrush) SystemBrushes.Window;
            }
        }
 
        private static SolidBrush DefaultBackgroundBrush
        { 
            get 
            {
                return (SolidBrush) SystemBrushes.AppWorkspace; 
            }
        }

        ///  
        [
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_DefaultCellStyleDescr), 
            AmbientValue(null)
        ] 
        public DataGridViewCellStyle DefaultCellStyle
        {
            get
            { 
                if (this.defaultCellStyle == null)
                { 
                    this.defaultCellStyle = this.DefaultDefaultCellStyle; 
                    return this.defaultCellStyle;
                } 
                else if (this.defaultCellStyle.BackColor == Color.Empty ||
                    this.defaultCellStyle.ForeColor == Color.Empty ||
                    this.defaultCellStyle.SelectionBackColor == Color.Empty ||
                    this.defaultCellStyle.SelectionForeColor == Color.Empty || 
                    this.defaultCellStyle.Font == null ||
                    this.defaultCellStyle.Alignment == DataGridViewContentAlignment.NotSet || 
                    this.defaultCellStyle.WrapMode == DataGridViewTriState.NotSet) 
                {
                    DataGridViewCellStyle defaultCellStyleTmp = new DataGridViewCellStyle(this.defaultCellStyle); 
                    defaultCellStyleTmp.Scope = DataGridViewCellStyleScopes.None;
                    if (this.defaultCellStyle.BackColor == Color.Empty)
                    {
                        defaultCellStyleTmp.BackColor = DefaultBackBrush.Color; 
                    }
                    if (this.defaultCellStyle.ForeColor == Color.Empty) 
                    { 
                        defaultCellStyleTmp.ForeColor = base.ForeColor;
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_ambientForeColor] = true; 
                    }
                    if (this.defaultCellStyle.SelectionBackColor == Color.Empty)
                    {
                        defaultCellStyleTmp.SelectionBackColor = DefaultSelectionBackBrush.Color; 
                    }
                    if (this.defaultCellStyle.SelectionForeColor == Color.Empty) 
                    { 
                        defaultCellStyleTmp.SelectionForeColor = DefaultSelectionForeBrush.Color;
                    } 
                    if (this.defaultCellStyle.Font == null)
                    {
                        defaultCellStyleTmp.Font = base.Font;
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_ambientFont] = true; 
                    }
                    if (this.defaultCellStyle.Alignment == DataGridViewContentAlignment.NotSet) 
                    { 
                        defaultCellStyleTmp.AlignmentInternal = DataGridViewContentAlignment.MiddleLeft;
                    } 
                    if (this.defaultCellStyle.WrapMode == DataGridViewTriState.NotSet)
                    {
                        defaultCellStyleTmp.WrapModeInternal = DataGridViewTriState.False;
                    } 
                    defaultCellStyleTmp.AddScope(this, DataGridViewCellStyleScopes.DataGridView);
                    return defaultCellStyleTmp; 
                } 
                else
                { 
                    return this.defaultCellStyle;
                }
            }
            set 
            {
                DataGridViewCellStyle cs = this.DefaultCellStyle; 
                cs.RemoveScope(DataGridViewCellStyleScopes.DataGridView); 
                this.defaultCellStyle = value;
                if (value != null) 
                {
                    this.defaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.DataGridView);
                }
                DataGridViewCellStyleDifferences dgvcsc = cs.GetDifferencesFrom(this.DefaultCellStyle); 
                if (dgvcsc != DataGridViewCellStyleDifferences.None)
                { 
                    this.CellStyleChangedEventArgs.ChangeAffectsPreferredSize = (dgvcsc == DataGridViewCellStyleDifferences.AffectPreferredSize); 
                    OnDefaultCellStyleChanged(this.CellStyleChangedEventArgs);
                } 
            }
        }

        private DataGridViewCellStyle DefaultDefaultCellStyle 
        {
            get 
            { 
                DataGridViewCellStyle defaultCellStyle = new DataGridViewCellStyle();
                defaultCellStyle.BackColor = DefaultBackBrush.Color; 
                defaultCellStyle.ForeColor = base.ForeColor;
                defaultCellStyle.SelectionBackColor = DefaultSelectionBackBrush.Color;
                defaultCellStyle.SelectionForeColor = DefaultSelectionForeBrush.Color;
                defaultCellStyle.Font = base.Font; 
                defaultCellStyle.AlignmentInternal = DataGridViewContentAlignment.MiddleLeft;
                defaultCellStyle.WrapModeInternal = DataGridViewTriState.False; 
                defaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.DataGridView); 

                this.dataGridViewState1[DATAGRIDVIEWSTATE1_ambientFont] = true; 
                this.dataGridViewState1[DATAGRIDVIEWSTATE1_ambientForeColor] = true;

                return defaultCellStyle;
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridViewDefaultCellStyleChangedDescr)
        ]
        public event EventHandler DefaultCellStyleChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWDEFAULTCELLSTYLECHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWDEFAULTCELLSTYLECHANGED, value);
            }
        } 

        private static SolidBrush DefaultForeBrush 
        { 
            get
            { 
                return (SolidBrush) SystemBrushes.WindowText;
            }
        }
 
        private static Color DefaultGridColor
        { 
            get 
            {
                return SystemColors.ControlDark; 
            }
        }

        private static SolidBrush DefaultHeadersBackBrush 
        {
            get 
            { 
                return (SolidBrush) SystemBrushes.Control;
            } 
        }

        private DataGridViewCellStyle DefaultRowHeadersDefaultCellStyle
        { 
            get
            { 
                DataGridViewCellStyle defaultStyle = new DataGridViewCellStyle(); 
                defaultStyle.BackColor = DefaultHeadersBackBrush.Color;
                defaultStyle.ForeColor = DefaultForeBrush.Color; 
                defaultStyle.SelectionBackColor = DefaultSelectionBackBrush.Color;
                defaultStyle.SelectionForeColor = DefaultSelectionForeBrush.Color;
                defaultStyle.Font = base.Font;
                defaultStyle.AlignmentInternal = DataGridViewContentAlignment.MiddleLeft; 
                defaultStyle.WrapModeInternal = DataGridViewTriState.True;
                defaultStyle.AddScope(this, DataGridViewCellStyleScopes.RowHeaders); 
 
                this.dataGridViewState1[DATAGRIDVIEWSTATE1_ambientRowHeadersFont] = true;
 
                return defaultStyle;
            }
        }
 
        private static SolidBrush DefaultSelectionBackBrush
        { 
            get 
            {
                return (SolidBrush) SystemBrushes.Highlight; 
            }
        }

        private static SolidBrush DefaultSelectionForeBrush 
        {
            get 
            { 
                return (SolidBrush) SystemBrushes.HighlightText;
            } 
        }

        /// 
        protected override Size DefaultSize 
        {
            get 
            { 
                return new Size(240, 150);
            } 
        }

        internal DisplayedBandsData DisplayedBandsInfo
        { 
            get
            { 
                return this.displayedBandsInfo; 
            }
        } 

        /// 
        /// 
        ///     Returns the client rect of the display area of the control. 
        ///     The DataGridView control return its client rectangle minus the potential scrollbars.
        ///  
        public override Rectangle DisplayRectangle { 
            get {
                Rectangle rectDisplay = this.ClientRectangle; 
                if (this.horizScrollBar != null && this.horizScrollBar.Visible)
                {
                    rectDisplay.Height -= this.horizScrollBar.Height;
                } 
                if (this.vertScrollBar != null && this.vertScrollBar.Visible)
                { 
                    rectDisplay.Width -= this.vertScrollBar.Width; 
                    if (this.RightToLeftInternal)
                    { 
                        rectDisplay.X = this.vertScrollBar.Width;
                    }
                }
                return rectDisplay; 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatBehavior),
            DefaultValue(DataGridViewEditMode.EditOnKeystrokeOrF2),
            SRDescription(SR.DataGridView_EditModeDescr)
        ] 
        public DataGridViewEditMode EditMode
        { 
            get 
            {
                return this.editMode; 
            }
            set
            {
                // Sequential enum.  Valid values are 0x0 to 0x4 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewEditMode.EditOnEnter, (int)DataGridViewEditMode.EditProgrammatically))
                { 
                     throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewEditMode)); 
                }
                if (this.editMode != value) 
                {
                    this.editMode = value;
                    OnEditModeChanged(EventArgs.Empty);
                } 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_EditModeChangedDescr)
        ]
        public event EventHandler EditModeChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWEDITMODECHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWEDITMODECHANGED, value);
            } 
        }
 
        internal Point MouseEnteredCellAddress 
        {
            get 
            {
                return this.ptMouseEnteredCell;
            }
        } 

        private bool MouseOverEditingControl 
        { 
            get
            { 
                if (this.editingControl != null)
                {
                    Point ptMouse = PointToClient(Control.MousePosition);
                    return this.editingControl.Bounds.Contains(ptMouse); 
                }
                return false; 
            } 
        }
 
        private bool MouseOverEditingPanel
        {
            get
            { 
                if (this.editingPanel != null)
                { 
                    Point ptMouse = PointToClient(Control.MousePosition); 
                    return this.editingPanel.Bounds.Contains(ptMouse);
                } 
                return false;
            }
        }
 
        private bool MouseOverScrollBar
        { 
            get 
            {
                Point ptMouse = PointToClient(Control.MousePosition); 
                if (this.vertScrollBar != null && this.vertScrollBar.Visible)
                {
                    if (this.vertScrollBar.Bounds.Contains(ptMouse))
                    { 
                        return true;
                    } 
                } 
                if (this.horizScrollBar != null && this.horizScrollBar.Visible)
                { 
                    return this.horizScrollBar.Bounds.Contains(ptMouse);
                }
                return false;
            } 
        }
 
        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced)
        ]
        public Control EditingControl
        { 
            get
            { 
                return this.editingControl; 
            }
        } 

        /// 
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced)
        ] 
        public Panel EditingPanel 
        {
            get 
            {
                if (this.editingPanel == null)
                {
                    this.editingPanel = new Panel(); 
                    this.editingPanel.AccessibleName = SR.GetString(SR.DataGridView_AccEditingPanelAccName);
                } 
                return this.editingPanel; 
            }
        } 

        /// 
        /// 
        ///     
        ///     Determines whether the DataGridView's header cells render using XP theming visual styles or not
        ///     when visual styles are enabled in the application. 
        ///     
        /// 
        [ 
            SRCategory(SR.CatAppearance),
            DefaultValue(true),
            SRDescription(SR.DataGridView_EnableHeadersVisualStylesDescr)
        ] 
        public bool EnableHeadersVisualStyles
        { 
            get 
            {
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_enableHeadersVisualStyles]; 
            }
            set
            {
                if (this.dataGridViewState2[DATAGRIDVIEWSTATE2_enableHeadersVisualStyles] != value) 
                {
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_enableHeadersVisualStyles] = value; 
                    //OnEnableHeadersVisualStylesChanged(EventArgs.Empty); 
                    // Some autosizing may have to be applied since the margins are potentially changed.
                    OnGlobalAutoSize(); // Put this into OnEnableHeadersVisualStylesChanged if created. 
                }
            }
        }
 
        /// 
        [ 
            Browsable(false), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public DataGridViewCell FirstDisplayedCell
        {
            get
            { 
                Point firstDisplayedCellAddress = this.FirstDisplayedCellAddress;
                if (firstDisplayedCellAddress.X >= 0) 
                { 
                    return this.Rows[firstDisplayedCellAddress.Y].Cells[firstDisplayedCellAddress.X]; // unshares the row of first displayed cell
                } 
                return null;
            }
            set
            { 
                if (value != null)
                { 
                    DataGridViewCell firstDisplayedCell = value; 
                    if (firstDisplayedCell.DataGridView != this)
                    { 
                        throw new ArgumentException(SR.GetString(SR.DataGridView_CellDoesNotBelongToDataGridView));
                    }
                    if (firstDisplayedCell.RowIndex == -1 || firstDisplayedCell.ColumnIndex == -1)
                    { 
                        throw new InvalidOperationException(SR.GetString(SR.DataGridView_FirstDisplayedCellCannotBeAHeaderOrSharedCell));
                    } 
 
                    Debug.Assert(firstDisplayedCell.RowIndex >= 0 &&
                        firstDisplayedCell.RowIndex < this.Rows.Count && 
                        firstDisplayedCell.ColumnIndex >= 0 &&
                        firstDisplayedCell.ColumnIndex < this.Columns.Count);

                    if (!firstDisplayedCell.Visible) 
                    {
                        throw new InvalidOperationException(SR.GetString(SR.DataGridView_FirstDisplayedCellCannotBeInvisible)); 
                    } 

                    if (!firstDisplayedCell.Frozen) 
                    {
                        if (!this.Rows[firstDisplayedCell.RowIndex].Frozen)
                        {
                            this.FirstDisplayedScrollingRowIndex = firstDisplayedCell.RowIndex; 
                        }
 
                        if (!this.Columns[firstDisplayedCell.ColumnIndex].Frozen) 
                        {
                            this.FirstDisplayedScrollingColumnIndex = firstDisplayedCell.ColumnIndex; 
                        }
                    }
                }
            } 
        }
 
        private Point FirstDisplayedCellAddress 
        {
            get 
            {
                Point ptFirstDisplayedCellAddress = new Point(-1, -1);
                ptFirstDisplayedCellAddress.Y = this.Rows.GetFirstRow(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen);
                if (ptFirstDisplayedCellAddress.Y == -1) 
                {
                    Debug.Assert(this.displayedBandsInfo.NumTotallyDisplayedFrozenRows == 0); 
                    if (this.displayedBandsInfo.FirstDisplayedScrollingRow >= 0) 
                    {
                        ptFirstDisplayedCellAddress.Y = this.displayedBandsInfo.FirstDisplayedScrollingRow; 
                    }
#if DEBUG
                    else
                    { 
                        Debug.Assert(this.displayedBandsInfo.FirstDisplayedScrollingRow == -1);
                        Debug.Assert(this.displayedBandsInfo.NumDisplayedScrollingRows == 0); 
                        Debug.Assert(this.displayedBandsInfo.NumTotallyDisplayedScrollingRows == 0); 
                    }
#endif 
                }
                if (ptFirstDisplayedCellAddress.Y >= 0)
                {
                    ptFirstDisplayedCellAddress.X = this.FirstDisplayedColumnIndex; 
                }
                return ptFirstDisplayedCellAddress; 
            } 
        }
 
        internal int FirstDisplayedColumnIndex
        {
            get
            { 
                if (!this.IsHandleCreated)
                { 
                    return -1; 
                }
 
                int firstDisplayedColumnIndex = -1;
                DataGridViewColumn dataGridViewColumn = this.Columns.GetFirstColumn(DataGridViewElementStates.Visible);
                if (dataGridViewColumn != null)
                { 
                    if (dataGridViewColumn.Frozen)
                    { 
                        firstDisplayedColumnIndex = dataGridViewColumn.Index; 
                    }
                    else if (this.displayedBandsInfo.FirstDisplayedScrollingCol >= 0) 
                    {
                        firstDisplayedColumnIndex = this.displayedBandsInfo.FirstDisplayedScrollingCol;
                    }
                } 
#if DEBUG
                DataGridViewColumn dataGridViewColumnDbg1 = this.Columns.GetFirstColumn(DataGridViewElementStates.Displayed); 
                int firstDisplayedColumnIndexDbg1 = (dataGridViewColumnDbg1 == null) ? -1 : dataGridViewColumnDbg1.Index; 

                int firstDisplayedColumnIndexDbg2 = -1; 
                DataGridViewColumn dataGridViewColumnDbg = this.Columns.GetFirstColumn(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen);
                if (dataGridViewColumnDbg != null)
                {
                    firstDisplayedColumnIndexDbg2 = dataGridViewColumnDbg.Index; 
                }
                else if (this.displayedBandsInfo.FirstDisplayedScrollingCol >= 0) 
                { 
                    firstDisplayedColumnIndexDbg2 = this.displayedBandsInfo.FirstDisplayedScrollingCol;
                } 
                else
                {
                    Debug.Assert(this.displayedBandsInfo.LastTotallyDisplayedScrollingCol == -1);
                } 
                Debug.Assert(firstDisplayedColumnIndex == firstDisplayedColumnIndexDbg1 || !this.Visible || this.displayedBandsInfo.Dirty);
                Debug.Assert(firstDisplayedColumnIndex == firstDisplayedColumnIndexDbg2 || this.displayedBandsInfo.Dirty); 
#endif 
                return firstDisplayedColumnIndex;
            } 
        }

        internal int FirstDisplayedRowIndex
        { 
            get
            { 
                if (!this.IsHandleCreated) 
                {
                    return -1; 
                }

                int firstDisplayedRowIndex = this.Rows.GetFirstRow(DataGridViewElementStates.Visible);
                if (firstDisplayedRowIndex != -1) 
                {
                    if ((this.Rows.GetRowState(firstDisplayedRowIndex) & DataGridViewElementStates.Frozen) == 0 && 
                        this.displayedBandsInfo.FirstDisplayedScrollingRow >= 0) 
                    {
                        firstDisplayedRowIndex = this.displayedBandsInfo.FirstDisplayedScrollingRow; 
                    }
                }
#if FALSE //DEBUG
                int firstDisplayedRowIndexDbg1 = this.Rows.GetFirstRow(DataGridViewElementStates.Displayed); 

                int firstDisplayedRowIndexDbg2 = this.Rows.GetFirstRow(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen); 
                if (firstDisplayedRowIndexDbg2 == -1) 
                {
                    if (this.displayedBandsInfo.FirstDisplayedScrollingRow >= 0) 
                    {
                        firstDisplayedRowIndexDbg2 = this.displayedBandsInfo.FirstDisplayedScrollingRow;
                    }
                } 

                Debug.Assert(firstDisplayedRowIndex == firstDisplayedRowIndexDbg1 || !this.Visible || this.displayedBandsInfo.Dirty, "firstDisplayedRowIndex =" + firstDisplayedRowIndex.ToString() + ", firstDisplayedRowIndexDbg1=" + firstDisplayedRowIndexDbg1.ToString()); 
                Debug.Assert(firstDisplayedRowIndex == firstDisplayedRowIndexDbg2 || this.displayedBandsInfo.Dirty, "firstDisplayedRowIndex =" + firstDisplayedRowIndex.ToString() + ", firstDisplayedRowIndexDbg2=" + firstDisplayedRowIndexDbg2.ToString()); 
#endif
                return firstDisplayedRowIndex; 
            }
        }

        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public int FirstDisplayedScrollingColumnHiddenWidth
        {
            get
            { 
                return this.negOffset;
            } 
        } 

        ///  
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public int FirstDisplayedScrollingColumnIndex
        { 
            get 
            {
                return this.displayedBandsInfo.FirstDisplayedScrollingCol; 
            }
            set
            {
                if (value < 0 || value >= this.Columns.Count) 
                {
                    throw new ArgumentOutOfRangeException("value"); 
                } 
                if (!this.Columns[value].Visible)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_FirstDisplayedScrollingColumnCannotBeInvisible));
                }
                if (this.Columns[value].Frozen)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_FirstDisplayedScrollingColumnCannotBeFrozen));
                } 
 
                if (!this.IsHandleCreated)
                { 
                    CreateHandle();
                }

                int displayWidth = this.layout.Data.Width; 
                if (displayWidth <= 0)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_NoRoomForDisplayedColumns)); 
                }
 
                int totalVisibleFrozenWidth = this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen);
                if (totalVisibleFrozenWidth >= displayWidth)
                {
                    Debug.Assert(totalVisibleFrozenWidth > 0); 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_FrozenColumnsPreventFirstDisplayedScrollingColumn));
                } 
 
                if (value == this.displayedBandsInfo.FirstDisplayedScrollingCol)
                { 
                    return;
                }

                if (this.ptCurrentCell.X >= 0 && 
                    !CommitEdit(DataGridViewDataErrorContexts.Parsing | DataGridViewDataErrorContexts.Commit | DataGridViewDataErrorContexts.Scroll,
                                false /*forCurrentCellChange*/, false /*forCurrentRowChange*/)) 
                { 
                    // Could not commit edited cell value - return silently
                    // [....]: should we throw an error here? 
                    return;
                }
                if (IsColumnOutOfBounds(value))
                { 
                    return;
                } 
                bool success = ScrollColumnIntoView(value, -1, /*committed*/ true, false /*forCurrentCellChange*/); 
                Debug.Assert(success);
 
                Debug.Assert(this.displayedBandsInfo.FirstDisplayedScrollingCol >= 0);
                Debug.Assert(this.displayedBandsInfo.FirstDisplayedScrollingCol == value ||
                             this.Columns.DisplayInOrder(this.displayedBandsInfo.FirstDisplayedScrollingCol, value));
                int maxHorizontalOffset = this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible) - displayWidth; 
                while (this.displayedBandsInfo.FirstDisplayedScrollingCol != value &&
                        this.HorizontalOffset < maxHorizontalOffset) 
                { 
                    ScrollColumns(1);
                } 
            }
        }

        ///  
        [
            Browsable(false), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public int FirstDisplayedScrollingRowIndex 
        {
            get
            {
                return this.displayedBandsInfo.FirstDisplayedScrollingRow; 
            }
            set 
            { 
                if (value < 0 || value >= this.Rows.Count)
                { 
                    throw new ArgumentOutOfRangeException("value");
                }
                if ((this.Rows.GetRowState(value) & DataGridViewElementStates.Visible) == 0)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_FirstDisplayedScrollingRowCannotBeInvisible));
                } 
                if ((this.Rows.GetRowState(value) & DataGridViewElementStates.Frozen) != 0) 
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_FirstDisplayedScrollingRowCannotBeFrozen)); 
                }

                if (!this.IsHandleCreated)
                { 
                    CreateHandle();
                } 
 
                int displayHeight = this.layout.Data.Height;
                if (displayHeight <= 0) 
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_NoRoomForDisplayedRows));
                }
 
                int totalVisibleFrozenHeight = this.Rows.GetRowsHeight(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen);
                if (totalVisibleFrozenHeight >= displayHeight) 
                { 
                    Debug.Assert(totalVisibleFrozenHeight > 0);
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_FrozenRowsPreventFirstDisplayedScrollingRow)); 
                }

                if (value == this.displayedBandsInfo.FirstDisplayedScrollingRow)
                { 
                    return;
                } 
 
                if (this.ptCurrentCell.X >= 0 &&
                    !CommitEdit(DataGridViewDataErrorContexts.Parsing | DataGridViewDataErrorContexts.Commit | DataGridViewDataErrorContexts.Scroll, 
                                false /*forCurrentCellChange*/, false /*forCurrentRowChange*/))
                {
                    // Could not commit edited cell value - return silently
                    // [....]: should we throw an error here? 
                    return;
                } 
                if (IsRowOutOfBounds(value)) 
                {
                    return; 
                }

                Debug.Assert(this.displayedBandsInfo.FirstDisplayedScrollingRow >= 0);
 
                if (value > this.displayedBandsInfo.FirstDisplayedScrollingRow)
                { 
                    int rowsToScroll = this.Rows.GetRowCount(DataGridViewElementStates.Visible, this.displayedBandsInfo.FirstDisplayedScrollingRow, value); 
                    Debug.Assert(rowsToScroll != 0);
                    ScrollRowsByCount(rowsToScroll, rowsToScroll > 1 ? ScrollEventType.LargeIncrement : ScrollEventType.SmallIncrement); 
                }
                else
                {
                    bool success = ScrollRowIntoView(-1, value, /*committed*/ true, false /*forCurrentCellChange*/); 
                    Debug.Assert(success);
                } 
            } 
        }
 
        /// 
        /// 
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ] 
        public override Color ForeColor
        { 
            get
            {
                return base.ForeColor;
            } 
            set
            { 
                base.ForeColor = value; 
            }
        } 

        /// 
        /// 
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ] 
        new public event EventHandler ForeColorChanged
        { 
            add
            {
                base.ForeColorChanged += value;
            } 
            remove
            { 
                base.ForeColorChanged -= value; 
            }
        } 

        /// 
        /// 
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ] 
        public override Font Font
        { 
            get
            {
                return base.Font;
            } 
            set
            { 
                base.Font = value; 
            }
        } 

        /// 
        /// 
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ] 
        new public event EventHandler FontChanged
        { 
            add
            {
                base.FontChanged += value;
            } 
            remove
            { 
                base.FontChanged -= value; 
            }
        } 

        /// 
        /// 
        ///    Gets or sets the grid color of the dataGridView (when Single mode is used). 
        /// 
        [ 
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridViewGridColorDescr)
        ] 
        public Color GridColor
        {
            get
            { 
                return this.gridPen.Color;
            } 
            set 
            {
                if (value.IsEmpty) 
                {
                    throw new ArgumentException(SR.GetString(SR.DataGridView_EmptyColor, "GridColor"));
                }
                if (value.A < 255) 
                {
                    throw new ArgumentException(SR.GetString(SR.DataGridView_TransparentColor, "GridColor")); 
                } 
                if (!value.Equals(this.gridPen.Color))
                { 
                    this.gridPen = new Pen(value);
                    OnGridColorChanged(EventArgs.Empty);
                }
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridViewOnGridColorChangedDescr)
        ]
        public event EventHandler GridColorChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWGRIDCOLORCHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWGRIDCOLORCHANGED, value);
            }
        } 

        ///  
        private bool ShouldSerializeGridColor() 
        {
            return !this.GridPen.Color.Equals(DefaultGridColor); 
        }

        internal Pen GridPen
        { 
            get
            { 
                return this.gridPen; 
            }
        } 

        internal int HorizontalOffset
        {
            get 
            {
                return this.horizontalOffset; 
            } 
            set
            { 
                if (value < 0)
                {
                    value = 0;
                } 
                int widthNotVisible = this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible) - this.layout.Data.Width;
                if (value > widthNotVisible && widthNotVisible > 0) 
                { 
                    value = widthNotVisible;
                } 
                if (value == this.horizontalOffset)
                {
                    return;
                } 

                ScrollEventType scrollEventType; 
                int oldFirstVisibleScrollingCol = this.displayedBandsInfo.FirstDisplayedScrollingCol; 
                int change = this.horizontalOffset - value;
                if (this.horizScrollBar.Enabled) 
                {
                    this.horizScrollBar.Value = value;
                }
                this.horizontalOffset = value; 

                int totalVisibleFrozenWidth = this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen); 
 
                Rectangle rectTmp = this.layout.Data;
                if (this.layout.ColumnHeadersVisible) 
                {
                    // column headers must scroll as well
                    rectTmp = Rectangle.Union(rectTmp, this.layout.ColumnHeaders);
                } 
                else if (this.SingleVerticalBorderAdded)
                { 
                    if (!this.RightToLeftInternal) 
                    {
                        rectTmp.X--; 
                    }
                    rectTmp.Width++;
                }
 
                if (this.SingleVerticalBorderAdded &&
                    totalVisibleFrozenWidth > 0) 
                { 
                    if (!this.RightToLeftInternal)
                    { 
                        rectTmp.X++;
                    }
                    rectTmp.Width--;
                } 

                if (!this.RightToLeftInternal) 
                { 
                    rectTmp.X += totalVisibleFrozenWidth;
                } 
                rectTmp.Width -= totalVisibleFrozenWidth;

                this.displayedBandsInfo.FirstDisplayedScrollingCol = ComputeFirstVisibleScrollingColumn();
                // update the lastTotallyDisplayedScrollingCol 
                ComputeVisibleColumns();
 
                if (this.editingControl != null && 
                    !this.Columns[this.ptCurrentCell.X].Frozen &&
                    this.displayedBandsInfo.FirstDisplayedScrollingCol > -1) 
                {
                    PositionEditingControl(true /*setLocation*/, false /*setSize*/, false /*setFocus*/);
                }
 
                // The mouse probably is not over the same cell after the scroll.
                UpdateMouseEnteredCell(null /*HitTestInfo*/, null /*MouseEventArgs*/); 
 
                if (oldFirstVisibleScrollingCol == this.displayedBandsInfo.FirstDisplayedScrollingCol)
                { 
                    scrollEventType = change > 0 ? ScrollEventType.SmallIncrement : ScrollEventType.SmallDecrement;
                }
                else if (this.Columns.DisplayInOrder(oldFirstVisibleScrollingCol, this.displayedBandsInfo.FirstDisplayedScrollingCol))
                { 
                    scrollEventType = this.Columns.GetColumnCount(DataGridViewElementStates.Visible, oldFirstVisibleScrollingCol, this.displayedBandsInfo.FirstDisplayedScrollingCol) > 1 ? ScrollEventType.LargeIncrement : ScrollEventType.SmallIncrement;
                } 
                else 
                {
                    Debug.Assert(this.Columns.DisplayInOrder(this.displayedBandsInfo.FirstDisplayedScrollingCol, oldFirstVisibleScrollingCol)); 
                    scrollEventType = this.Columns.GetColumnCount(DataGridViewElementStates.Visible, this.displayedBandsInfo.FirstDisplayedScrollingCol, oldFirstVisibleScrollingCol) > 1 ? ScrollEventType.LargeDecrement : ScrollEventType.SmallDecrement;
                }

                NativeMethods.RECT[] rects = CreateScrollableRegion(rectTmp); 
                if (this.RightToLeftInternal)
                { 
                    change = -change; 
                }
                ScrollRectangles(rects, change); 
                if (!this.dataGridViewState2[DATAGRIDVIEWSTATE2_stopRaisingHorizontalScroll])
                {
                    OnScroll(scrollEventType, this.horizontalOffset + change, this.horizontalOffset, ScrollOrientation.HorizontalScroll);
                } 
                FlushDisplayedChanged();
            } 
        } 

        ///  
        protected ScrollBar HorizontalScrollBar
        {
            get
            { 
                return this.horizScrollBar;
            } 
        } 

        ///  
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public int HorizontalScrollingOffset
        { 
            get 
            {
                return this.horizontalOffset; 
            }
            set
            {
                // int widthNotVisible = this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible) - this.layout.Data.Width; 
                if (value < 0)
                { 
                    throw new ArgumentOutOfRangeException("HorizontalScrollingOffset", SR.GetString(SR.InvalidLowBoundArgumentEx, "HorizontalScrollingOffset", (value).ToString(CultureInfo.CurrentCulture), (0).ToString(CultureInfo.CurrentCulture))); 
                }
                // Intentionally ignoring the out of range situation. 
                // else if (value > widthNotVisible && widthNotVisible > 0)
                //{
                //    throw new ArgumentOutOfRangeException(SR.GetString(SR.DataGridView_PropertyTooLarge, "HorizontalScrollingOffset", (widthNotVisible).ToString()));
                //} 
                else if (value > 0 && (this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible) - this.layout.Data.Width) <= 0)
                { 
                    // Intentionally ignoring the case where dev tries to set value while there is no horizontal scrolling possible. 
                    // throw new ArgumentOutOfRangeException("HorizontalScrollingOffset", SR.GetString(SR.DataGridView_PropertyMustBeZero));
                    Debug.Assert(this.horizontalOffset == 0); 
                    return;
                }
                if (value == this.horizontalOffset)
                { 
                    return;
                } 
                this.HorizontalOffset = value; 
            }
        } 

        private System.Windows.Forms.Timer HorizScrollTimer
        {
            get 
            {
                if (this.horizScrollTimer == null) 
                { 
                    this.horizScrollTimer = new System.Windows.Forms.Timer();
                    this.horizScrollTimer.Tick += new System.EventHandler(HorizScrollTimer_Tick); 
                }
                return this.horizScrollTimer;
            }
        } 

        private bool InAdjustFillingColumns 
        { 
            get
            { 
                return this.dataGridViewOper[DATAGRIDVIEWOPER_inAdjustFillingColumn] || this.dataGridViewOper[DATAGRIDVIEWOPER_inAdjustFillingColumns];
            }
        }
 
        internal bool InBeginEdit
        { 
            get 
            {
                return this.dataGridViewOper[DATAGRIDVIEWOPER_inBeginEdit]; 
            }
        }

        internal bool InDisplayIndexAdjustments 
        {
            get 
            { 
                return this.dataGridViewOper[DATAGRIDVIEWOPER_inDisplayIndexAdjustments];
            } 
            set
            {
                this.dataGridViewOper[DATAGRIDVIEWOPER_inDisplayIndexAdjustments] = value;
            } 
        }
 
        internal bool InEndEdit 
        {
            get 
            {
                return this.dataGridViewOper[DATAGRIDVIEWOPER_inEndEdit];
            }
        } 

        private DataGridViewCellStyle InheritedEditingCellStyle 
        { 
            get
            { 
                if (this.ptCurrentCell.X == -1)
                {
                    return null;
                } 

                return this.CurrentCellInternal.GetInheritedStyleInternal(this.ptCurrentCell.Y); 
            } 
        }
 
        internal bool InInitialization
        {
            get
            { 
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_initializing];
            } 
        } 

        internal bool InSortOperation 
        {
            get
            {
                return this.dataGridViewOper[DATAGRIDVIEWOPER_inSort]; 
            }
        } 
 
        /// 
        [Browsable(false)] 
        public bool IsCurrentCellDirty
        {
            get
            { 
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedCellChanged];
            } 
        } 

        private bool IsCurrentCellDirtyInternal 
        {
            set
            {
                if (value != this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedCellChanged]) 
                {
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedCellChanged] = value; 
                    OnCurrentCellDirtyStateChanged(EventArgs.Empty); 
                }
            } 
        }

        /// 
        [Browsable(false)] 
        public bool IsCurrentCellInEditMode
        { 
            get 
            {
                return this.editingControl != null || this.dataGridViewState1[DATAGRIDVIEWSTATE1_currentCellInEditMode]; 
            }
        }

        ///  
        // Only used in bound scenarios, when binding to a IEditableObject
        [Browsable(false)] 
        public bool IsCurrentRowDirty 
        {
            get 
            {
                if (!this.VirtualMode)
                {
                    return this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedRowChanged] || this.IsCurrentCellDirty; 
                }
                else 
                { 
                    QuestionEventArgs qe = new QuestionEventArgs(this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedRowChanged] || this.IsCurrentCellDirty);
                    OnRowDirtyStateNeeded(qe); 
                    return qe.Response;
                }
            }
        } 

        internal bool IsCurrentRowDirtyInternal 
        { 
            set
            { 
                if (value != this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedRowChanged])
                {
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedRowChanged] = value;
                    if (this.RowHeadersVisible && this.ShowEditingIcon && this.ptCurrentCell.Y >= 0) 
                    {
                        // Force the pencil to appear in the row header 
                        InvalidateCellPrivate(-1, this.ptCurrentCell.Y); 
                    }
                } 
            }
        }

        private bool IsEscapeKeyEffective 
        {
            get 
            { 
                return this.dataGridViewOper[DATAGRIDVIEWOPER_trackColResize] ||
                       this.dataGridViewOper[DATAGRIDVIEWOPER_trackRowResize] || 
                       this.dataGridViewOper[DATAGRIDVIEWOPER_trackColHeadersResize] ||
                       this.dataGridViewOper[DATAGRIDVIEWOPER_trackRowHeadersResize] ||
                       this.dataGridViewOper[DATAGRIDVIEWOPER_trackColRelocation] ||
                       this.IsCurrentCellDirty || 
                       ((this.VirtualMode || this.DataSource != null) && this.IsCurrentRowDirty) ||
                       (this.EditMode != DataGridViewEditMode.EditOnEnter && this.editingControl != null || 
                       this.dataGridViewState1[DATAGRIDVIEWSTATE1_newRowEdited]); 
            }
        } 

        private bool IsMinimized
        {
            get 
            {
                Form parentForm = this.TopLevelControlInternal as Form; 
                return parentForm != null && parentForm.WindowState == FormWindowState.Minimized; 
            }
        } 

        internal bool IsRestricted
        {
            get 
            {
                if (!this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestrictedChecked]) 
                { 
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestricted] = false;
                    try 
                    {
                        IntSecurity.AllWindows.Demand();
                    }
                    catch (SecurityException) 
                    {
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestricted] = true; 
                    } 
                    catch
                    { 
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestricted] = true; // To be on the safe side
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestrictedChecked] = true;
                        throw;
                    } 
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestrictedChecked] = true;
                } 
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestricted]; 
            }
        } 

        private bool IsSharedCellReadOnly(DataGridViewCell dataGridViewCell, int rowIndex)
        {
            Debug.Assert(dataGridViewCell != null); 
            Debug.Assert(rowIndex >= 0);
            DataGridViewElementStates rowState = this.Rows.GetRowState(rowIndex); 
            return this.ReadOnly || 
                   (rowState & DataGridViewElementStates.ReadOnly) != 0 ||
                   (dataGridViewCell.OwningColumn != null && dataGridViewCell.OwningColumn.ReadOnly) || 
                   dataGridViewCell.StateIncludes(DataGridViewElementStates.ReadOnly);
        }

        internal bool IsSharedCellSelected(DataGridViewCell dataGridViewCell, int rowIndex) 
        {
            Debug.Assert(dataGridViewCell != null); 
            Debug.Assert(rowIndex >= 0); 
            DataGridViewElementStates rowState = this.Rows.GetRowState(rowIndex);
            return (rowState & DataGridViewElementStates.Selected) != 0 || 
                   (dataGridViewCell.OwningColumn != null && dataGridViewCell.OwningColumn.Selected) ||
                   dataGridViewCell.StateIncludes(DataGridViewElementStates.Selected);
        }
 
        internal bool IsSharedCellVisible(DataGridViewCell dataGridViewCell, int rowIndex)
        { 
            Debug.Assert(dataGridViewCell != null); 
            Debug.Assert(rowIndex >= 0);
            DataGridViewElementStates rowState = this.Rows.GetRowState(rowIndex); 
            return (rowState & DataGridViewElementStates.Visible) != 0 &&
                   (dataGridViewCell.OwningColumn != null && dataGridViewCell.OwningColumn.Visible);
        }
 
        internal LayoutData LayoutInfo
        { 
            get 
            {
                if (this.layout.dirty && this.IsHandleCreated) 
                {
                    PerformLayoutPrivate(false /*useRowShortcut*/, true /*computeVisibleRows*/, false /*invalidInAdjustFillingColumns*/, false /*repositionEditingControl*/);
                }
                return this.layout; 
            }
        } 
 
        internal Point MouseDownCellAddress
        { 
            get
            {
                return this.ptMouseDownCell;
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatBehavior), 
            DefaultValue(true),
            SRDescription(SR.DataGridView_MultiSelectDescr)
        ]
        public bool MultiSelect 
        {
            get 
            { 
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_multiSelect];
            } 
            set
            {
                if (this.MultiSelect != value)
                { 
                    ClearSelection();
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_multiSelect] = value; 
                    OnMultiSelectChanged(EventArgs.Empty); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewOnMultiSelectChangedDescr) 
        ] 
        public event EventHandler MultiSelectChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWMULTISELECTCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWMULTISELECTCHANGED, value); 
            }
        } 

        /// 
        [
            Browsable(false), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public int NewRowIndex 
        {
            get 
            {
                return this.newRowIndex;
            }
        } 

        internal bool NoDimensionChangeAllowed 
        { 
            get
            { 
                return this.noDimensionChangeCount > 0;
            }
        }
 
        private int NoSelectionChangeCount
        { 
            get 
            {
                return this.noSelectionChangeCount; 
            }
            set
            {
                Debug.Assert(value >= 0); 
                this.noSelectionChangeCount = value;
                if (value == 0) 
                { 
                    FlushSelectionChanged();
                } 
            }
        }

        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Never), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public new Padding Padding
        {
            get
            { 
                return base.Padding;
            } 
            set 
            {
                base.Padding = value; 
            }
        }

        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Never), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public new event EventHandler PaddingChanged
        {
            add
            { 
                base.PaddingChanged += value;
            } 
            remove 
            {
                base.PaddingChanged -= value; 
            }
        }

        internal DataGridViewCellStyle PlaceholderCellStyle 
        {
            get 
            { 
                if (this.placeholderCellStyle == null)
                { 
                    this.placeholderCellStyle = new DataGridViewCellStyle();
                }
                return this.placeholderCellStyle;
            } 
        }
 
        ///  
        [
            Browsable(true), 
            DefaultValue(false),
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_ReadOnlyDescr)
        ] 
        public bool ReadOnly
        { 
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_readOnly]; 
            }
            set
            {
                if (value != this.dataGridViewState1[DATAGRIDVIEWSTATE1_readOnly]) 
                {
                    if (value && 
                        this.ptCurrentCell.X != -1 && 
                        this.IsCurrentCellInEditMode)
                    { 
                        // Current cell becomes read-only. Exit editing mode.
                        if (!EndEdit(DataGridViewDataErrorContexts.Parsing | DataGridViewDataErrorContexts.Commit,
                                     DataGridViewValidateCellInternal.Always /*validateCell*/,
                                     false /*fireCellLeave*/, 
                                     false /*fireCellEnter*/,
                                     false /*fireRowLeave*/, 
                                     false /*fireRowEnter*/, 
                                     false /*fireLeave*/,
                                     true /*keepFocus*/, 
                                     false /*resetCurrentCell*/,
                                     false /*resetAnchorCell*/))
                        {
                            throw new InvalidOperationException(SR.GetString(SR.DataGridView_CommitFailedCannotCompleteOperation)); 
                        }
                    } 
 
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_readOnly] = value;
 
                    if (value)
                    {
                        try
                        { 
                            this.dataGridViewOper[DATAGRIDVIEWOPER_inReadOnlyChange] = true;
                            for (int columnIndex = 0; columnIndex < this.Columns.Count; columnIndex++) 
                            { 
                                SetReadOnlyColumnCore(columnIndex, false);
                            } 
                            int rowCount = this.Rows.Count;
                            for (int rowIndex = 0; rowIndex < rowCount; rowIndex++)
                            {
                                SetReadOnlyRowCore(rowIndex, false); 
                            }
                        } 
                        finally 
                        {
                            this.dataGridViewOper[DATAGRIDVIEWOPER_inReadOnlyChange] = false; 
                        }
                    }
#if DEBUG
                    else 
                    {
                        Debug.Assert(this.individualReadOnlyCells.Count == 0); 
                        for (int columnIndex = 0; columnIndex < this.Columns.Count; columnIndex++) 
                        {
                            Debug.Assert(this.Columns[columnIndex].ReadOnly == false); 
                        }
                        int rowCount = this.Rows.Count;
                        for (int rowIndex = 0; rowIndex < rowCount; rowIndex++)
                        { 
                            Debug.Assert((this.Rows.GetRowState(rowIndex) & DataGridViewElementStates.ReadOnly) == 0);
                        } 
                    } 
#endif
                    OnReadOnlyChanged(EventArgs.Empty); 
                }
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridViewOnReadOnlyChangedDescr)
        ] 
        public event EventHandler ReadOnlyChanged
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWREADONLYCHANGED, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWREADONLYCHANGED, value); 
            }
        }

        private void ResetCurrentCell() 
        {
            if (this.ptCurrentCell.X != -1 && 
                !SetCurrentCellAddressCore(-1, -1, true /*setAnchorCellAddress*/, true /*validateCurrentCell*/, false /*throughMouseClick*/)) 
            {
                // Edited value couldn't be committed or aborted 
                throw new InvalidOperationException(SR.GetString(SR.DataGridView_CellChangeCannotBeCommittedOrAborted));
            }
        }
 
        internal bool ResizingOperationAboutToStart
        { 
            get 
            {
                return this.dataGridViewOper[DATAGRIDVIEWOPER_resizingOperationAboutToStart]; 
            }
        }

        internal bool RightToLeftInternal 
        {
            get 
            { 
                if (this.dataGridViewState2[DATAGRIDVIEWSTATE2_rightToLeftValid])
                { 
                    return this.dataGridViewState2[DATAGRIDVIEWSTATE2_rightToLeftMode];
                }
                this.dataGridViewState2[DATAGRIDVIEWSTATE2_rightToLeftMode] = (this.RightToLeft == RightToLeft.Yes);
                this.dataGridViewState2[DATAGRIDVIEWSTATE2_rightToLeftValid] = true; 
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_rightToLeftMode];
            } 
        } 

        ///  
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            DefaultValue(0)
        ] 
        public int RowCount 
        {
            get 
            {
                return this.Rows.Count;
            }
            set 
            {
                if (this.AllowUserToAddRowsInternal) 
                { 
                    if (value < 1)
                    { 
                        throw new ArgumentOutOfRangeException("RowCount", SR.GetString(SR.InvalidLowBoundArgumentEx, "RowCount", value.ToString(CultureInfo.CurrentCulture), (1).ToString(CultureInfo.CurrentCulture)));
                    }
                }
                else 
                {
                    if (value < 0) 
                    { 
                        throw new ArgumentOutOfRangeException("RowCount", SR.GetString(SR.InvalidLowBoundArgumentEx, "RowCount", value.ToString(CultureInfo.CurrentCulture), (0).ToString(CultureInfo.CurrentCulture)));
                    } 
                }
                if (this.DataSource != null)
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_CannotSetRowCountOnDataBoundDataGridView)); 
                }
                if (value != this.Rows.Count) 
                { 
                    if (value == 0)
                    { 
                        // Total removal of the rows.
                        this.Rows.Clear();
                    }
                    else if (value < this.Rows.Count) 
                    {
                        // Some rows need to be removed, from the tail of the rows collection 
                        while (value < this.Rows.Count) 
                        {
                            int currentRowCount = this.Rows.Count; 
                            this.Rows.RemoveAt(currentRowCount - (this.AllowUserToAddRowsInternal ? 2 :  1));
                            if (this.Rows.Count >= currentRowCount)
                            {
                                // Row removal failed. We stop the loop. 
                                break;
                            } 
                        } 
                    }
                    else 
                    {
                        // Some rows need to be appened.
                        if (this.Columns.Count == 0)
                        { 
                            // There are no columns yet, we simply create a single DataGridViewTextBoxColumn.
                            DataGridViewTextBoxColumn dataGridViewTextBoxColumn = new DataGridViewTextBoxColumn(); 
                            this.Columns.Add(dataGridViewTextBoxColumn); 
                        }
                        int rowsToAdd = value - this.Rows.Count; 
                        if (rowsToAdd > 0)
                        {
                            this.Rows.Add(rowsToAdd);
                        } 
                    }
                } 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_RowHeadersBorderStyleDescr), 
            Browsable(true),
            DefaultValue(DataGridViewHeaderBorderStyle.Raised) 
        ] 
        public DataGridViewHeaderBorderStyle RowHeadersBorderStyle
        { 
            get
            {
                switch (this.advancedRowHeadersBorderStyle.All)
                { 
                    case DataGridViewAdvancedCellBorderStyle.NotSet:
                        return DataGridViewHeaderBorderStyle.Custom; 
 
                    case DataGridViewAdvancedCellBorderStyle.None:
                        return DataGridViewHeaderBorderStyle.None; 

                    case DataGridViewAdvancedCellBorderStyle.Single:
                        return DataGridViewHeaderBorderStyle.Single;
 
                    case DataGridViewAdvancedCellBorderStyle.InsetDouble:
                        return DataGridViewHeaderBorderStyle.Sunken; 
 
                    case DataGridViewAdvancedCellBorderStyle.OutsetPartial:
                        return DataGridViewHeaderBorderStyle.Raised; 

                    default:
                        return DataGridViewHeaderBorderStyle.Custom;
                } 
            }
            set 
            { 
                // Sequential enum.  Valid values are 0x0 to 0x4
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewHeaderBorderStyle.Custom, (int)DataGridViewHeaderBorderStyle.None)) 
                {
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewHeaderBorderStyle));
                }
 
                if (value != this.RowHeadersBorderStyle)
                { 
                    if (value == DataGridViewHeaderBorderStyle.Custom) 
                    {
                        throw new ArgumentException(SR.GetString(SR.DataGridView_CustomCellBorderStyleInvalid, "RowHeadersBorderStyle")); 
                    }
                    this.dataGridViewOper[DATAGRIDVIEWOPER_inBorderStyleChange] = true;
                    try
                    { 
                        switch (value)
                        { 
                            case DataGridViewHeaderBorderStyle.Single: 
                                this.advancedRowHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.Single;
                                break; 

                            case DataGridViewHeaderBorderStyle.Raised:
                                this.advancedRowHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.OutsetPartial;
                                break; 

                            case DataGridViewHeaderBorderStyle.Sunken: 
                                this.advancedRowHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.InsetDouble; 
                                break;
 
                            case DataGridViewHeaderBorderStyle.None:
                                this.advancedRowHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                break;
                        } 
                    }
                    finally 
                    { 
                        this.dataGridViewOper[DATAGRIDVIEWOPER_inBorderStyleChange] = false;
                    } 
                    OnRowHeadersBorderStyleChanged(EventArgs.Empty);
                }
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_RowHeadersBorderStyleChangedDescr) 
        ]
        public event EventHandler RowHeadersBorderStyleChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERSBORDERSTYLECHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERSBORDERSTYLECHANGED, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_RowHeadersDefaultCellStyleDescr),
            AmbientValue(null) 
        ]
        public DataGridViewCellStyle RowHeadersDefaultCellStyle
        {
            get 
            {
                if (this.rowHeadersDefaultCellStyle == null) 
                { 
                    this.rowHeadersDefaultCellStyle = this.DefaultRowHeadersDefaultCellStyle;
                } 
                return this.rowHeadersDefaultCellStyle;
            }
            set
            { 
                DataGridViewCellStyle cs = this.RowHeadersDefaultCellStyle;
                cs.RemoveScope(DataGridViewCellStyleScopes.RowHeaders); 
                this.rowHeadersDefaultCellStyle = value; 
                if (value != null)
                { 
                    this.rowHeadersDefaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.RowHeaders);
                }
                DataGridViewCellStyleDifferences dgvcsc = cs.GetDifferencesFrom(this.RowHeadersDefaultCellStyle);
                if (dgvcsc != DataGridViewCellStyleDifferences.None) 
                {
                    this.CellStyleChangedEventArgs.ChangeAffectsPreferredSize = (dgvcsc == DataGridViewCellStyleDifferences.AffectPreferredSize); 
                    OnRowHeadersDefaultCellStyleChanged(this.CellStyleChangedEventArgs); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewRowHeadersDefaultCellStyleChangedDescr) 
        ] 
        public event EventHandler RowHeadersDefaultCellStyleChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERSDEFAULTCELLSTYLECHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERSDEFAULTCELLSTYLECHANGED, value); 
            }
        } 

        /// 
        /// 
        ///     
        ///       Gets or sets a value indicating whether the dataGridView's row headers are
        ///       visible. 
        ///     
        /// 
        [ 
            SRCategory(SR.CatAppearance),
            DefaultValue(true),
            SRDescription(SR.DataGridViewRowHeadersVisibleDescr)
        ] 
        public bool RowHeadersVisible
        { 
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_rowHeadersVisible]; 
            }
            set
            {
                if (this.RowHeadersVisible != value) 
                {
                    if (!value && 
                        (this.autoSizeRowsMode == DataGridViewAutoSizeRowsMode.AllHeaders || this.autoSizeRowsMode == DataGridViewAutoSizeRowsMode.DisplayedHeaders)) 
                    {
                        throw new InvalidOperationException(SR.GetString(SR.DataGridView_RowHeadersCannotBeInvisible)); 
                    }
                    using (LayoutTransaction.CreateTransactionIf(this.AutoSize, this.ParentInternal, this, PropertyNames.RowHeadersVisible))
                    {
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_rowHeadersVisible] = value; 
                        this.layout.RowHeadersVisible = value;
                        this.displayedBandsInfo.EnsureDirtyState(); 
                        if (!this.AutoSize) 
                        {
                            PerformLayoutPrivate(false /*useRowShortcut*/, false /*computeVisibleRows*/, true /*invalidInAdjustFillingColumns*/, true /*repositionEditingControl*/); 
                        }
                        InvalidateInside();
                        OnRowHeadersGlobalAutoSize(value /*expandingRows*/);
                    } 
                }
            } 
        } 

        ///  
        [
            SRCategory(SR.CatLayout),
            Localizable(true),
            SRDescription(SR.DataGridView_RowHeadersWidthDescr) 
        ]
        public int RowHeadersWidth 
        { 
            get
            { 
                return this.rowHeadersWidth;
            }
            set
            { 
                if (value < minimumRowHeadersWidth)
                { 
                    throw new ArgumentOutOfRangeException("RowHeadersWidth", SR.GetString(SR.InvalidLowBoundArgumentEx, "RowHeadersWidth", (value).ToString(CultureInfo.CurrentCulture), (minimumRowHeadersWidth).ToString(CultureInfo.CurrentCulture))); 
                }
                if (value > maxHeadersThickness) 
                {
                    throw new ArgumentOutOfRangeException("RowHeadersWidth", SR.GetString(SR.InvalidHighBoundArgumentEx, "RowHeadersWidth", (value).ToString(CultureInfo.CurrentCulture), (maxHeadersThickness).ToString(CultureInfo.CurrentCulture)));
                }
                if (this.RowHeadersWidthSizeMode != DataGridViewRowHeadersWidthSizeMode.EnableResizing && 
                    this.RowHeadersWidthSizeMode != DataGridViewRowHeadersWidthSizeMode.DisableResizing)
                { 
                    this.cachedRowHeadersWidth = value; 
                }
                else if (this.rowHeadersWidth != value) 
                {
                    this.RowHeadersWidthInternal = value;
                }
            } 
        }
 
        private int RowHeadersWidthInternal 
        {
            set 
            {
                using (LayoutTransaction.CreateTransactionIf(this.AutoSize, this.ParentInternal, this, PropertyNames.RowHeadersWidth))
                {
                    Debug.Assert(this.rowHeadersWidth != value); 
                    Debug.Assert(value >= minimumRowHeadersWidth);
                    this.rowHeadersWidth = value; 
                    if (this.AutoSize) 
                    {
                        InvalidateInside(); 
                    }
                    else
                    {
                        if (this.layout.RowHeadersVisible) 
                        {
                            PerformLayoutPrivate(false /*useRowShortcut*/, false /*computeVisibleRows*/, true /*invalidInAdjustFillingColumns*/, true /*repositionEditingControl*/); 
                            InvalidateInside(); 
                        }
                    } 
                    OnRowHeadersWidthChanged(EventArgs.Empty);
                }
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewRowHeadersWidthChangedDescr) 
        ]
        public event EventHandler RowHeadersWidthChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERSWIDTHCHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERSWIDTHCHANGED, value);
            }
        }
 
        private bool ShouldSerializeRowHeadersWidth()
        { 
            return (this.rowHeadersWidthSizeMode == DataGridViewRowHeadersWidthSizeMode.EnableResizing || this.rowHeadersWidthSizeMode == DataGridViewRowHeadersWidthSizeMode.DisableResizing) && 
                   defaultRowHeadersWidth != this.RowHeadersWidth;
        } 

        /// 
        /// 
        ///     
        ///       Gets or sets a value that determines the behavior for adjusting the row headers width.
        ///     
        ///  
        [
            DefaultValue(DataGridViewRowHeadersWidthSizeMode.EnableResizing), 
            RefreshProperties(RefreshProperties.All),
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_RowHeadersWidthSizeModeDescr)
        ] 
        public DataGridViewRowHeadersWidthSizeMode RowHeadersWidthSizeMode
        { 
            get 
            {
                return this.rowHeadersWidthSizeMode; 
            }
            set
            {
                // Sequential enum.  Valid values are 0x0 to 0x4 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewRowHeadersWidthSizeMode.EnableResizing, (int)DataGridViewRowHeadersWidthSizeMode.AutoSizeToFirstHeader))
                { 
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewRowHeadersWidthSizeMode)); 
                }
                if (this.rowHeadersWidthSizeMode != value) 
                {
                    /*if (value != DataGridViewRowHeadersWidthSizeMode.EnableResizing &&
                     *    value != DataGridViewRowHeadersWidthSizeMode.DisableResizing &&
                     *    !this.RowHeadersVisible) 
                    {
                        We intentionally don't throw an error because of designer code spit order. 
                    }*/ 
                    DataGridViewAutoSizeModeEventArgs dgvasme = new DataGridViewAutoSizeModeEventArgs(this.rowHeadersWidthSizeMode != DataGridViewRowHeadersWidthSizeMode.EnableResizing &&
                                                                                                      this.rowHeadersWidthSizeMode != DataGridViewRowHeadersWidthSizeMode.DisableResizing); 
                    this.rowHeadersWidthSizeMode = value;
                    OnRowHeadersWidthSizeModeChanged(dgvasme);
                }
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_RowHeadersWidthSizeModeChangedDescr)
        ]
        public event DataGridViewAutoSizeModeEventHandler RowHeadersWidthSizeModeChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERSWIDTHSIZEMODECHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERSWIDTHSIZEMODECHANGED, value);
            }
        } 

        ///  
        [ 
            Browsable(false)
        ] 
        public DataGridViewRowCollection Rows
        {
            get
            { 
                if (this.dataGridViewRows == null)
                { 
                    this.dataGridViewRows = CreateRowsInstance(); 
                }
                return this.dataGridViewRows; 
            }
        }

        ///  
        [
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_RowsDefaultCellStyleDescr) 
        ]
        public DataGridViewCellStyle RowsDefaultCellStyle 
        {
            get
            {
                if (this.rowsDefaultCellStyle == null) 
                {
                    this.rowsDefaultCellStyle = new DataGridViewCellStyle(); 
                    this.rowsDefaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.Rows); 
                }
                return this.rowsDefaultCellStyle; 
            }
            set
            {
                DataGridViewCellStyle cs = this.RowsDefaultCellStyle; 
                cs.RemoveScope(DataGridViewCellStyleScopes.Rows);
                this.rowsDefaultCellStyle = value; 
                if (value != null) 
                {
                    this.rowsDefaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.Rows); 
                }
                DataGridViewCellStyleDifferences dgvcsc = cs.GetDifferencesFrom(this.RowsDefaultCellStyle);
                if (dgvcsc != DataGridViewCellStyleDifferences.None)
                { 
                    this.CellStyleChangedEventArgs.ChangeAffectsPreferredSize = (dgvcsc == DataGridViewCellStyleDifferences.AffectPreferredSize);
                    OnRowsDefaultCellStyleChanged(this.CellStyleChangedEventArgs); 
                } 
            }
        } 

        /// 
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridViewRowsDefaultCellStyleChangedDescr)
        ] 
        public event EventHandler RowsDefaultCellStyleChanged 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWSDEFAULTCELLSTYLECHANGED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWSDEFAULTCELLSTYLECHANGED, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatAppearance),
            Browsable(true), 
            SRDescription(SR.DataGridView_RowTemplateDescr),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Content) 
        ] 
        public DataGridViewRow RowTemplate
        { 
            get
            {
                if (this.rowTemplate == null)
                { 
                    this.rowTemplate = new DataGridViewRow();
                } 
                return this.rowTemplate; 
            }
            set 
            {
                DataGridViewRow dataGridViewRow = value;
                if (dataGridViewRow != null)
                { 
                    if (dataGridViewRow.DataGridView != null)
                    { 
                        throw new InvalidOperationException(SR.GetString(SR.DataGridView_RowAlreadyBelongsToDataGridView)); 
                    }
                    //if (dataGridViewRow.Selected) 
                    //{
                    //    throw new InvalidOperationException(SR.GetString(SR.DataGridView_RowTemplateCannotBeSelected));
                    //}
                } 
                this.rowTemplate = dataGridViewRow;
            } 
        } 

        private bool ShouldSerializeRowTemplate() 
        {
            return this.rowTemplate != null;
        }
 
        internal DataGridViewRow RowTemplateClone
        { 
            get 
            {
                DataGridViewRow rowTemplateClone = (DataGridViewRow) this.RowTemplate.Clone(); 
                CompleteCellsCollection(rowTemplateClone);
                return rowTemplateClone;
            }
        } 

        ///  
        ///  
        ///     Possible return values are given by the ScrollBars enumeration.
        ///  
        [
            DefaultValue(ScrollBars.Both),
            Localizable(true),
            SRCategory(SR.CatLayout), 
            SRDescription(SR.DataGridView_ScrollBarsDescr)
        ] 
        public ScrollBars ScrollBars 
        {
            get 
            {
                return this.scrollBars;
            }
            set 
            {
                // Sequential enum.  Valid values are 0x0 to 0x3 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)ScrollBars.None, (int)ScrollBars.Both)) 
                {
                     throw new InvalidEnumArgumentException("value", (int)value, typeof(ScrollBars)); 
                }

                if (this.scrollBars != value)
                { 
                    using (LayoutTransaction.CreateTransactionIf(this.AutoSize, this.ParentInternal, this, PropertyNames.ScrollBars))
                    { 
                        // Before changing the value of this.scrollBars, we scroll to the top-left cell to 
                        // avoid inconsitent state of scrollbars.
                        DataGridViewColumn dataGridViewColumn = this.Columns.GetFirstColumn(DataGridViewElementStates.Visible); 
                        int firstVisibleRowIndex = this.Rows.GetFirstRow(DataGridViewElementStates.Visible);

                        if (dataGridViewColumn != null && firstVisibleRowIndex != -1)
                        { 
                            if (!ScrollIntoView(dataGridViewColumn.Index, firstVisibleRowIndex, false))
                            { 
                                throw new InvalidOperationException(SR.GetString(SR.DataGridView_CellChangeCannotBeCommittedOrAborted)); 
                            }
                        } 
                        Debug.Assert(this.HorizontalOffset == 0);
                        Debug.Assert(this.VerticalOffset == 0);

                        this.scrollBars = value; 

                        if (!this.AutoSize) 
                        { 
                            PerformLayoutPrivate(false /*useRowShortcut*/, false /*computeVisibleRows*/, true /*invalidInAdjustFillingColumns*/, true /*repositionEditingControl*/);
                        } 
                        Invalidate();
                    }
                }
            } 
        }
 
        ///  
        [
            Browsable(false) 
        ]
        public DataGridViewSelectedCellCollection SelectedCells
        {
            [ 
                SuppressMessage("Microsoft.Performance", "CA1817:DoNotCallPropertiesThatCloneValuesInLoops"), // not legitimate
                SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes") // consider using generics instead of DataGridViewIntLinkedList 
            ] 
            get
            { 
                DataGridViewSelectedCellCollection stcc = new DataGridViewSelectedCellCollection();
                switch (this.SelectionMode)
                {
                    case DataGridViewSelectionMode.CellSelect: 
                    {
                        // Note: If we change the design and decide that SelectAll() should use band selection, 
                        // we need to add those to the selected cells. 
                        stcc.AddCellLinkedList(this.individualSelectedCells);
                        break; 
                    }
                    case DataGridViewSelectionMode.FullColumnSelect:
                    case DataGridViewSelectionMode.ColumnHeaderSelect:
                    { 
                        foreach (int columnIndex in this.selectedBandIndexes)
                        { 
                            foreach (DataGridViewRow dataGridViewRow in this.Rows)   // unshares all rows! 
                            {
                                stcc.Add(dataGridViewRow.Cells[columnIndex]); 
                            }
                        }
                        if (this.SelectionMode == DataGridViewSelectionMode.ColumnHeaderSelect)
                        { 
                            stcc.AddCellLinkedList(this.individualSelectedCells);
                        } 
                        break; 
                    }
                    case DataGridViewSelectionMode.FullRowSelect: 
                    case DataGridViewSelectionMode.RowHeaderSelect:
                    {
                        foreach (int rowIndex in this.selectedBandIndexes)
                        { 
                            DataGridViewRow dataGridViewRow = (DataGridViewRow) this.Rows[rowIndex]; // unshares the selected row
                            foreach (DataGridViewCell dataGridViewCell in dataGridViewRow.Cells) 
                            { 
                                stcc.Add(dataGridViewCell);
                            } 
                        }
                        if (this.SelectionMode == DataGridViewSelectionMode.RowHeaderSelect)
                        {
                            stcc.AddCellLinkedList(this.individualSelectedCells); 
                        }
                        break; 
                    } 
                }
                return stcc; 
            }
        }

        ///  
        [
            Browsable(false) 
        ] 
        public DataGridViewSelectedColumnCollection SelectedColumns
        { 
            [
                SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes") // consider using generics instead of DataGridViewIntLinkedList
            ]
            get 
            {
                DataGridViewSelectedColumnCollection strc = new DataGridViewSelectedColumnCollection(); 
                switch (this.SelectionMode) 
                {
                    case DataGridViewSelectionMode.CellSelect: 
                    case DataGridViewSelectionMode.FullRowSelect:
                    case DataGridViewSelectionMode.RowHeaderSelect:
                        break;
                    case DataGridViewSelectionMode.FullColumnSelect: 
                    case DataGridViewSelectionMode.ColumnHeaderSelect:
                        foreach (int columnIndex in this.selectedBandIndexes) 
                        { 
                            strc.Add(this.Columns[columnIndex]);
                        } 
                        break;
                }
                return strc;
            } 
        }
 
        ///  
        [
            Browsable(false), 
        ]
        public DataGridViewSelectedRowCollection SelectedRows
        {
            [ 
                SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes"), // using specialized DataGridViewIntLinkedList class instead of generics
                SuppressMessage("Microsoft.Performance", "CA1817:DoNotCallPropertiesThatCloneValuesInLoops") // not legitimate 
            ] 
            get
            { 
                DataGridViewSelectedRowCollection strc = new DataGridViewSelectedRowCollection();
                switch (this.SelectionMode)
                {
                    case DataGridViewSelectionMode.CellSelect: 
                    case DataGridViewSelectionMode.FullColumnSelect:
                    case DataGridViewSelectionMode.ColumnHeaderSelect: 
                        break; 
                    case DataGridViewSelectionMode.FullRowSelect:
                    case DataGridViewSelectionMode.RowHeaderSelect: 
                        foreach (int rowIndex in this.selectedBandIndexes)
                        {
                            strc.Add((DataGridViewRow) this.Rows[rowIndex]); // unshares the selected row
                        } 
                        break;
                } 
                return strc; 
            }
        } 

        /// 
        [
            Browsable(true), 
            SRCategory(SR.CatBehavior),
            DefaultValue(DataGridViewSelectionMode.RowHeaderSelect), 
            SRDescription(SR.DataGridView_SelectionModeDescr) 
        ]
        public DataGridViewSelectionMode SelectionMode 
        {
            get
            {
                return this.selectionMode; 
            }
            set 
            { 
                // Sequential enum.  Valid values are 0x0 to 0x4
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewSelectionMode.CellSelect, (int)DataGridViewSelectionMode.ColumnHeaderSelect)) 
                {
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewSelectionMode));
                }
 
                if (this.SelectionMode != value)
                { 
                    if (!this.dataGridViewState2[DATAGRIDVIEWSTATE2_initializing] && 
                        (value == DataGridViewSelectionMode.FullColumnSelect || value == DataGridViewSelectionMode.ColumnHeaderSelect))
                    { 
                        foreach (DataGridViewColumn dataGridViewColumn in this.Columns)
                        {
                            if (dataGridViewColumn.SortMode == DataGridViewColumnSortMode.Automatic)
                            { 
                                throw new InvalidOperationException(SR.GetString(SR.DataGridView_SelectionModeAndSortModeClash, (value).ToString()));
                            } 
                        } 
                    }
                    ClearSelection(); 
                    this.selectionMode = value;
                }
            }
        } 

        ///  
        [ 
            DefaultValue(true),
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_ShowCellErrorsDescr)
        ]
        public bool ShowCellErrors
        { 
            get
            { 
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_showCellErrors]; 
            }
            set 
            {
                if (this.ShowCellErrors != value)
                {
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_showCellErrors] = value; 

                    // Put this into OnShowCellErrorsChanged if created. 
                    if (this.IsHandleCreated && !this.DesignMode) 
                    {
                        if (value && !this.ShowRowErrors && !this.ShowCellToolTips) 
                        {
                            // the tool tip hasn't yet been activated
                            // activate it now
                            this.toolTipControl.Activate(!String.IsNullOrEmpty(this.toolTipCaption)); 
                        }
 
                        if (!value && !this.ShowRowErrors && !this.ShowCellToolTips) 
                        {
                            // there is no reason to keep the tool tip activated 
                            // deactivate it
                            this.toolTipCaption = String.Empty;
                            this.toolTipControl.Activate(false /*activate*/);
                        } 

                        if (!value && (this.ShowRowErrors || this.ShowCellToolTips)) 
                        { 
                            // reset the tool tip
                            this.toolTipControl.Activate(!String.IsNullOrEmpty(this.toolTipCaption)); 
                        }

                        // Some autosizing may have to be applied since the potential presence of error icons influences the preferred sizes.
                        OnGlobalAutoSize(); 
                    }
 
                    if (!this.layout.dirty && !this.DesignMode) 
                    {
                        this.Invalidate(Rectangle.Union(this.layout.Data, this.layout.ColumnHeaders)); 
                        this.Invalidate(this.layout.TopLeftHeader);
                    }
                }
            } 
        }
 
        ///  
        [
            DefaultValue(true), 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_ShowCellToolTipsDescr)
        ]
        public bool ShowCellToolTips 
        {
            get 
            { 
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_showCellToolTips];
            } 
            set
            {
                if (this.ShowCellToolTips != value)
                { 
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_showCellToolTips] = value;
 
                    if (this.IsHandleCreated && !this.DesignMode) 
                    {
                        if (value && !this.ShowRowErrors && !this.ShowCellErrors) 
                        {
                            // the tool tip hasn't yet been activated
                            // activate it now
                            this.toolTipControl.Activate(!String.IsNullOrEmpty(this.toolTipCaption) /*activate*/); 
                        }
 
                        if (!value && !this.ShowRowErrors && !this.ShowCellErrors) 
                        {
                            // there is no reason to keep the tool tip activated 
                            // deactivate it
                            this.toolTipCaption = String.Empty;
                            this.toolTipControl.Activate(false /*activate*/);
                        } 

                        if (!value && (this.ShowRowErrors || this.ShowCellErrors)) 
                        { 
                            bool activate = !String.IsNullOrEmpty(this.toolTipCaption);
                            Point mouseCoord = System.Windows.Forms.Control.MousePosition; 
                            activate &= this.ClientRectangle.Contains(PointToClient(mouseCoord));

                            // reset the tool tip
                            this.toolTipControl.Activate(activate); 
                        }
                    } 
 
                    if (!this.layout.dirty && !this.DesignMode)
                    { 
                        Invalidate(this.layout.Data);
                    }
                }
            } 
        }
 
        ///  
        [
            DefaultValue(true), 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_ShowEditingIconDescr)
        ]
        public bool ShowEditingIcon 
        {
            get 
            { 
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_showEditingIcon];
            } 
            set
            {
                if (this.ShowEditingIcon != value)
                { 
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_showEditingIcon] = value;
 
                    // invalidate the row header to pick up the new ShowEditingIcon value 
                    if (this.RowHeadersVisible)
                    { 
                        if (this.VirtualMode || this.DataSource != null)
                        {
                            if (this.IsCurrentRowDirty)
                            { 
                                Debug.Assert(this.ptCurrentCell.Y >= 0);
                                InvalidateCellPrivate(-1, this.ptCurrentCell.Y); 
                            } 
                        }
                        else 
                        {
                            if (this.IsCurrentCellDirty) {
                                Debug.Assert(this.ptCurrentCell.Y >= 0);
                                InvalidateCellPrivate(-1, this.ptCurrentCell.Y); 
                            }
                        } 
                    } 
                }
            } 
        }

        /// 
        [ 
            DefaultValue(true),
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_ShowRowErrorsDescr) 
        ]
        public bool ShowRowErrors 
        {
            get
            {
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_showRowErrors]; 
            }
            set 
            { 
                if (this.ShowRowErrors != value)
                { 
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_showRowErrors] = value;

                    if (this.IsHandleCreated && !this.DesignMode)
                    { 
                        if (value && !this.ShowCellErrors && !this.ShowCellToolTips)
                        { 
                            // the tool tip hasn't yet been activated 
                            // activate it now
                            this.toolTipControl.Activate(!String.IsNullOrEmpty(this.toolTipCaption)); 
                        }

                        if (!value && !this.ShowCellErrors && !this.ShowCellToolTips)
                        { 
                            // there is no reason to keep the tool tip activated
                            // deactivate it 
                            this.toolTipCaption = String.Empty; 
                            this.toolTipControl.Activate(false /*activate*/);
                        } 

                        if (!value && (this.ShowCellErrors || this.ShowCellToolTips))
                        {
                            // reset the tool tip 
                            this.toolTipControl.Activate(!String.IsNullOrEmpty(this.toolTipCaption));
                        } 
                    } 

                    if (!this.layout.dirty && !this.DesignMode) 
                    {
                        Invalidate(this.layout.RowHeaders);
                    }
                } 
            }
        } 
 
        internal bool SingleHorizontalBorderAdded
        { 
            get
            {
                return !this.layout.ColumnHeadersVisible &&
                    (this.AdvancedCellBorderStyle.All == DataGridViewAdvancedCellBorderStyle.Single || 
                     this.CellBorderStyle == DataGridViewCellBorderStyle.SingleHorizontal);
            } 
        } 

        internal bool SingleVerticalBorderAdded 
        {
            get
            {
                return !this.layout.RowHeadersVisible && 
                    (this.AdvancedCellBorderStyle.All == DataGridViewAdvancedCellBorderStyle.Single ||
                     this.CellBorderStyle == DataGridViewCellBorderStyle.SingleVertical); 
            } 
        }
 
        /// 
        [
            Browsable(false)
        ] 
        public DataGridViewColumn SortedColumn
        { 
            get 
            {
                return this.sortedColumn; 
            }
        }

        ///  
        [
            Browsable(false) 
        ] 
        public SortOrder SortOrder
        { 
            get
            {
                return this.sortOrder;
            } 
        }
 
        ///  
        /// 
        ///     
        ///    
        /// 
        [
            SRCategory(SR.CatBehavior), 
            DefaultValue(false),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            SRDescription(SR.DataGridView_StandardTabDescr) 
        ]
        public bool StandardTab 
        {
            get
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_standardTab]; 
            }
            set 
            { 
                if (this.dataGridViewState1[DATAGRIDVIEWSTATE1_standardTab] != value)
                { 
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_standardTab] = value;
                    //OnStandardTabChanged(EventArgs.Empty);
                }
            } 
        }
 
        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Never),
            Bindable(false)
        ]
        public override string Text 
        {
            get 
            { 
                return base.Text;
            } 
            set
            {
                base.Text = value;
            } 
        }
 
        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Never)
        ]
        new public event EventHandler TextChanged
        { 
            add
            { 
                base.TextChanged += value; 
            }
            remove 
            {
                base.TextChanged -= value;
            }
        } 

        ///  
        [ 
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
            SuppressMessage("Microsoft.Design", "CA1023:IndexersShouldNotBeMultidimensional")
        ]
        public DataGridViewCell this[int columnIndex, int rowIndex]
        { 
            get
            { 
                DataGridViewRow row = this.Rows[rowIndex]; 
                return row.Cells[columnIndex];
            } 
            set
            {
                DataGridViewRow row = this.Rows[rowIndex];
                row.Cells[columnIndex] = value; 
            }
        } 
 
        /// 
        [ 
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
            SuppressMessage("Microsoft.Design", "CA1023:IndexersShouldNotBeMultidimensional")
        ] 
        public DataGridViewCell this[string columnName, int rowIndex]
        { 
            get 
            {
                DataGridViewRow row = this.Rows[rowIndex]; 
                return row.Cells[columnName];
            }
            set
            { 
                DataGridViewRow row = this.Rows[rowIndex];
                row.Cells[columnName] = value; 
            } 
        }
 
        private string ToolTipPrivate
        {
            get
            { 
                return this.toolTipCaption;
            } 
        } 

        ///  
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public DataGridViewHeaderCell TopLeftHeaderCell
        { 
            get 
            {
                if (this.topLeftHeaderCell == null) 
                {
                    this.TopLeftHeaderCell = new DataGridViewTopLeftHeaderCell();
                }
                return this.topLeftHeaderCell; 
            }
            set 
            { 
                if (this.topLeftHeaderCell != value)
                { 
                    if (this.topLeftHeaderCell != null)
                    {
                        // Detach existing header cell
                        this.topLeftHeaderCell.DataGridViewInternal = null; 
                    }
                    this.topLeftHeaderCell = value; 
                    if (value != null) 
                    {
                        this.topLeftHeaderCell.DataGridViewInternal = this; 
                    }
                    if (this.ColumnHeadersVisible && this.RowHeadersVisible)
                    {
                        // If headers (rows or columns) are autosized, then this.RowHeadersWidth or this.ColumnHeadersHeight 
                        // must be updated based on new cell preferred size
                        OnColumnHeadersGlobalAutoSize(); 
                        // In all cases, the top left cell needs to repaint 
                        Invalidate(new Rectangle(this.layout.Inside.X, this.layout.Inside.Y, this.RowHeadersWidth, this.ColumnHeadersHeight));
                    } 
                }
            }
        }
 
        /// 
        [ 
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced)
        ] 
        public Cursor UserSetCursor
        {
            get
            { 
                if (this.dataGridViewState1[DATAGRIDVIEWSTATE1_customCursorSet])
                { 
                    return this.oldCursor; 
                }
                else 
                {
                    return this.Cursor;
                }
            } 
        }
 
        internal int VerticalOffset 
        {
            get 
            {
                return this.verticalOffset;
            }
            set 
            {
                if (value < 0) 
                { 
                    value = 0;
                } 
                int totalVisibleFrozenHeight = this.Rows.GetRowsHeight(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen);
                int fittingTrailingScrollingRowsHeight = ComputeHeightOfFittingTrailingScrollingRows(totalVisibleFrozenHeight);
                if (value > this.vertScrollBar.Maximum - fittingTrailingScrollingRowsHeight)
                { 
                    value = this.vertScrollBar.Maximum - fittingTrailingScrollingRowsHeight;
                } 
                if (value == this.verticalOffset) 
                {
                    return; 
                }

                int change = value - this.verticalOffset;
                if (this.vertScrollBar.Enabled) 
                {
                    this.vertScrollBar.Value = value; 
                } 
                ScrollRowsByHeight(change); // calculate how many rows need to be scrolled based on 'change'
            } 
        }

        /// 
        protected ScrollBar VerticalScrollBar 
        {
            get 
            { 
                return this.vertScrollBar;
            } 
        }

        /// 
        [ 
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ] 
        public int VerticalScrollingOffset
        { 
            get
            {
                return this.verticalOffset;
            } 
        }
 
        private System.Windows.Forms.Timer VertScrollTimer 
        {
            get 
            {
                if (this.vertScrollTimer == null)
                {
                    this.vertScrollTimer = new System.Windows.Forms.Timer(); 
                    this.vertScrollTimer.Tick += new System.EventHandler(VertScrollTimer_Tick);
                } 
                return this.vertScrollTimer; 
            }
        } 

        /// 
        /// 
        ///     
        ///    
        ///  
        [ 
            SRCategory(SR.CatBehavior),
            DefaultValue(false), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridViewVirtualModeDescr)
        ]
        public bool VirtualMode 
        {
            get 
            { 
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_virtualMode];
            } 
            set
            {
                if (this.dataGridViewState1[DATAGRIDVIEWSTATE1_virtualMode] != value)
                { 
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_virtualMode] = value;
                    InvalidateRowHeights(); 
                    //OnVirtualModeChanged(EventArgs.Empty); 
                }
            } 
        }

        private bool VisibleCellExists
        { 
            get
            { 
                if (null == this.Columns.GetFirstColumn(DataGridViewElementStates.Visible)) 
                {
                    return false; 
                }
                return -1 != this.Rows.GetFirstRow(DataGridViewElementStates.Visible);
            }
        } 

        // Events start here 
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewAutoSizeColumnModeChangedDescr)
        ]
        public event DataGridViewAutoSizeColumnModeEventHandler AutoSizeColumnModeChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWAUTOSIZECOLUMNMODECHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWAUTOSIZECOLUMNMODECHANGED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_CancelRowEditDescr)
        ]
        public event QuestionEventHandler CancelRowEdit
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCANCELROWEDIT, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCANCELROWEDIT, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatData),
            SRDescription(SR.DataGridView_CellBeginEditDescr) 
        ]
        public event DataGridViewCellCancelEventHandler CellBeginEdit
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLBEGINEDIT, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLBEGINEDIT, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_CellClickDescr)
        ] 
        public event DataGridViewCellEventHandler CellClick
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLCLICK, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLCLICK, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_CellContentClick) 
        ]
        public event DataGridViewCellEventHandler CellContentClick 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLCONTENTCLICK, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLCONTENTCLICK, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_CellContentDoubleClick) 
        ] 
        public event DataGridViewCellEventHandler CellContentDoubleClick
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLCONTENTDOUBLECLICK, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLCONTENTDOUBLECLICK, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_CellContextMenuStripChanged),
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ] 
        public event DataGridViewCellEventHandler CellContextMenuStripChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLCONTEXTMENUSTRIPCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLCONTEXTMENUSTRIPCHANGED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_CellContextMenuStripNeeded),
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ] 
        public event DataGridViewCellContextMenuStripNeededEventHandler CellContextMenuStripNeeded
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLCONTEXTMENUSTRIPNEEDED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLCONTEXTMENUSTRIPNEEDED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_CellDoubleClickDescr)
        ] 
        public event DataGridViewCellEventHandler CellDoubleClick 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLDOUBLECLICK, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLDOUBLECLICK, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatData),
            SRDescription(SR.DataGridView_CellEndEditDescr) 
        ]
        public event DataGridViewCellEventHandler CellEndEdit 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLENDEDIT, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLENDEDIT, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatFocus),
            SRDescription(SR.DataGridView_CellEnterDescr)
        ] 
        public event DataGridViewCellEventHandler CellEnter
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLENTER, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLENTER, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_CellErrorTextChangedDescr)
        ]
        public event DataGridViewCellEventHandler CellErrorTextChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLERRORTEXTCHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLERRORTEXTCHANGED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatData), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_CellErrorTextNeededDescr)
        ]
        public event DataGridViewCellErrorTextNeededEventHandler CellErrorTextNeeded 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLERRORTEXTNEEDED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLERRORTEXTNEEDED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatDisplay), 
            SRDescription(SR.DataGridView_CellFormattingDescr)
        ]
        public event DataGridViewCellFormattingEventHandler CellFormatting
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLFORMATTING, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLFORMATTING, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatFocus),
            SRDescription(SR.DataGridView_CellLeaveDescr) 
        ]
        public event DataGridViewCellEventHandler CellLeave
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLLEAVE, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLLEAVE, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_CellMouseClickDescr)
        ] 
        public event DataGridViewCellMouseEventHandler CellMouseClick
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSECLICK, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSECLICK, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_CellMouseDoubleClickDescr) 
        ]
        public event DataGridViewCellMouseEventHandler CellMouseDoubleClick 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSEDOUBLECLICK, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSEDOUBLECLICK, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_CellMouseDownDescr) 
        ] 
        public event DataGridViewCellMouseEventHandler CellMouseDown
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSEDOWN, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSEDOWN, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_CellMouseEnterDescr)
        ] 
        public event DataGridViewCellEventHandler CellMouseEnter 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSEENTER, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSEENTER, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_CellMouseLeaveDescr) 
        ]
        public event DataGridViewCellEventHandler CellMouseLeave 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSELEAVE, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSELEAVE, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_CellMouseMoveDescr)
        ] 
        public event DataGridViewCellMouseEventHandler CellMouseMove
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSEMOVE, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSEMOVE, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_CellMouseUpDescr)
        ]
        public event DataGridViewCellMouseEventHandler CellMouseUp 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSEUP, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSEUP, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatDisplay), 
            SRDescription(SR.DataGridView_CellPaintingDescr)
        ]
        public event DataGridViewCellPaintingEventHandler CellPainting
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLPAINTING, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLPAINTING, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatDisplay),
            SRDescription(SR.DataGridView_CellParsingDescr) 
        ]
        public event DataGridViewCellParsingEventHandler CellParsing
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLPARSING, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLPARSING, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_CellStateChangedDescr)
        ] 
        public event DataGridViewCellStateChangedEventHandler CellStateChanged
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLSTATECHANGED, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLSTATECHANGED, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_CellStyleChangedDescr) 
        ]
        public event DataGridViewCellEventHandler CellStyleChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLSTYLECHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLSTYLECHANGED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_CellStyleContentChangedDescr) 
        ] 
        public event DataGridViewCellStyleContentChangedEventHandler CellStyleContentChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLSTYLECONTENTCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLSTYLECONTENTCHANGED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_CellToolTipTextChangedDescr)
        ] 
        public event DataGridViewCellEventHandler CellToolTipTextChanged 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLTOOLTIPTEXTCHANGED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLTOOLTIPTEXTCHANGED, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_CellToolTipTextNeededDescr), 
            EditorBrowsable(EditorBrowsableState.Advanced)
        ] 
        public event DataGridViewCellToolTipTextNeededEventHandler CellToolTipTextNeeded 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLTOOLTIPTEXTNEEDED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLTOOLTIPTEXTNEEDED, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatFocus),
            SRDescription(SR.DataGridView_CellValidatedDescr) 
        ]
        public event DataGridViewCellEventHandler CellValidated 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLVALIDATED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLVALIDATED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatFocus),
            SRDescription(SR.DataGridView_CellValidatingDescr)
        ] 
        public event DataGridViewCellValidatingEventHandler CellValidating
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLVALIDATING, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLVALIDATING, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatAction),
            SRDescription(SR.DataGridView_CellValueChangedDescr)
        ]
        public event DataGridViewCellEventHandler CellValueChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLVALUECHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLVALUECHANGED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatData), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_CellValueNeededDescr)
        ]
        public event DataGridViewCellValueEventHandler CellValueNeeded 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLVALUENEEDED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLVALUENEEDED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatData), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_CellValuePushedDescr)
        ]
        public event DataGridViewCellValueEventHandler CellValuePushed 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLVALUEPUSHED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLVALUEPUSHED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_ColumnAddedDescr)
        ]
        public event DataGridViewColumnEventHandler ColumnAdded
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNADDED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNADDED, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnContextMenuStripChangedDescr) 
        ]
        public event DataGridViewColumnEventHandler ColumnContextMenuStripChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNCONTEXTMENUSTRIPCHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNCONTEXTMENUSTRIPCHANGED, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_ColumnDataPropertyNameChangedDescr)
        ] 
        public event DataGridViewColumnEventHandler ColumnDataPropertyNameChanged
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNDATAPROPERTYNAMECHANGED, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNDATAPROPERTYNAMECHANGED, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_ColumnDefaultCellStyleChangedDescr) 
        ]
        public event DataGridViewColumnEventHandler ColumnDefaultCellStyleChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNDEFAULTCELLSTYLECHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNDEFAULTCELLSTYLECHANGED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnDisplayIndexChangedDescr) 
        ] 
        public event DataGridViewColumnEventHandler ColumnDisplayIndexChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNDISPLAYINDEXCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNDISPLAYINDEXCHANGED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_ColumnDividerDoubleClickDescr)
        ] 
        public event DataGridViewColumnDividerDoubleClickEventHandler ColumnDividerDoubleClick 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNDIVIDERDOUBLECLICK, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNDIVIDERDOUBLECLICK, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnDividerWidthChangedDescr) 
        ]
        public event DataGridViewColumnEventHandler ColumnDividerWidthChanged 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNDIVIDERWIDTHCHANGED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNDIVIDERWIDTHCHANGED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_ColumnHeaderMouseClickDescr)
        ] 
        public event DataGridViewCellMouseEventHandler ColumnHeaderMouseClick
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERMOUSECLICK, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERMOUSECLICK, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_ColumnHeaderMouseDoubleClickDescr)
        ]
        public event DataGridViewCellMouseEventHandler ColumnHeaderMouseDoubleClick 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERMOUSEDOUBLECLICK, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERMOUSEDOUBLECLICK, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_ColumnHeaderCellChangedDescr)
        ]
        public event DataGridViewColumnEventHandler ColumnHeaderCellChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERCELLCHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERCELLCHANGED, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnMinimumWidthChangedDescr) 
        ]
        public event DataGridViewColumnEventHandler ColumnMinimumWidthChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNMINIMUMWIDTHCHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNMINIMUMWIDTHCHANGED, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_ColumnNameChangedDescr)
        ] 
        public event DataGridViewColumnEventHandler ColumnNameChanged
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNNAMECHANGED, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNNAMECHANGED, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_ColumnRemovedDescr) 
        ]
        public event DataGridViewColumnEventHandler ColumnRemoved 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNREMOVED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNREMOVED, value);
            } 
        }

        /*/// 
        ///  
        public event EventHandler ColumnsDefaultCellStyleChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNSDEFAULTCELLSTYLECHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNSDEFAULTCELLSTYLECHANGED, value); 
            }
        }*/ 
 
        /// 
        [ 
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridViewColumnSortModeChangedDescr)
        ]
        public event DataGridViewColumnEventHandler ColumnSortModeChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNSORTMODECHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNSORTMODECHANGED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_ColumnStateChangedDescr)
        ]
        public event DataGridViewColumnStateChangedEventHandler ColumnStateChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNSTATECHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNSTATECHANGED, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnToolTipTextChangedDescr) 
        ]
        public event DataGridViewColumnEventHandler ColumnToolTipTextChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNTOOLTIPTEXTCHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNTOOLTIPTEXTCHANGED, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_ColumnWidthChangedDescr)
        ] 
        public event DataGridViewColumnEventHandler ColumnWidthChanged
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNWIDTHCHANGED, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNWIDTHCHANGED, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_CurrentCellChangedDescr) 
        ]
        public event EventHandler CurrentCellChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCURRENTCELLCHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCURRENTCELLCHANGED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatBehavior),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            SRDescription(SR.DataGridView_CurrentCellDirtyStateChangedDescr) 
        ]
        public event EventHandler CurrentCellDirtyStateChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCURRENTCELLDIRTYSTATECHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCURRENTCELLDIRTYSTATECHANGED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatData),
            SRDescription(SR.DataGridView_DataBindingCompleteDescr) 
        ] 
        public event DataGridViewBindingCompleteEventHandler DataBindingComplete
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWDATABINDINGCOMPLETE, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWDATABINDINGCOMPLETE, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_DataErrorDescr)
        ] 
        public event DataGridViewDataErrorEventHandler DataError 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWDATAERROR, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWDATAERROR, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatData),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            SRDescription(SR.DataGridView_DefaultValuesNeededDescr)
        ] 
        public event DataGridViewRowEventHandler DefaultValuesNeeded 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWDEFAULTVALUESNEEDED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWDEFAULTVALUESNEEDED, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatAction),
            SRDescription(SR.DataGridView_EditingControlShowingDescr) 
        ]
        public event DataGridViewEditingControlShowingEventHandler EditingControlShowing 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWEDITINGCONTROLSHOWING, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWEDITINGCONTROLSHOWING, value);
            } 
        } 

        /* 
        /// 
        public event QuestionEventHandler KeepNewRow
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWKEEPNEWROW, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWKEEPNEWROW, value);
            }
        }*/
 
        /*/// 
        ///  
        public event EventHandler NewRowDiscarded 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWNEWROWDISCARDED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWNEWROWDISCARDED, value); 
            } 
        }*/
 
        /// 
        [
            SRCategory(SR.CatData),
            SRDescription(SR.DataGridView_NewRowNeededDescr) 
        ]
        public event DataGridViewRowEventHandler NewRowNeeded 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWNEWROWNEEDED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWNEWROWNEEDED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_RowContextMenuStripChangedDescr)
        ] 
        public event DataGridViewRowEventHandler RowContextMenuStripChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWCONTEXTMENUSTRIPCHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWCONTEXTMENUSTRIPCHANGED, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatData),
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_RowContextMenuStripNeededDescr)
        ] 
        public event DataGridViewRowContextMenuStripNeededEventHandler RowContextMenuStripNeeded
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWCONTEXTMENUSTRIPNEEDED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWCONTEXTMENUSTRIPNEEDED, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_RowDefaultCellStyleChangedDescr)
        ]
        public event DataGridViewRowEventHandler RowDefaultCellStyleChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWDEFAULTCELLSTYLECHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWDEFAULTCELLSTYLECHANGED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatData), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_RowDirtyStateNeededDescr)
        ]
        public event QuestionEventHandler RowDirtyStateNeeded 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWDIRTYSTATENEEDED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWDIRTYSTATENEEDED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_RowDividerDoubleClickDescr)
        ]
        public event DataGridViewRowDividerDoubleClickEventHandler RowDividerDoubleClick
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWDIVIDERDOUBLECLICK, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWDIVIDERDOUBLECLICK, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_RowDividerHeightChangedDescr) 
        ]
        public event DataGridViewRowEventHandler RowDividerHeightChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWDIVIDERHEIGHTCHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWDIVIDERHEIGHTCHANGED, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatFocus), 
            SRDescription(SR.DataGridView_RowEnterDescr)
        ] 
        public event DataGridViewCellEventHandler RowEnter
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWENTER, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWENTER, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_RowErrorTextChangedDescr) 
        ]
        public event DataGridViewRowEventHandler RowErrorTextChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWERRORTEXTCHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWERRORTEXTCHANGED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatData),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            SRDescription(SR.DataGridView_RowErrorTextNeededDescr) 
        ]
        public event DataGridViewRowErrorTextNeededEventHandler RowErrorTextNeeded 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWERRORTEXTNEEDED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWERRORTEXTNEEDED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_RowHeaderMouseClickDescr) 
        ] 
        public event DataGridViewCellMouseEventHandler RowHeaderMouseClick
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERMOUSECLICK, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERMOUSECLICK, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_RowHeaderMouseDoubleClickDescr)
        ] 
        public event DataGridViewCellMouseEventHandler RowHeaderMouseDoubleClick 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERMOUSEDOUBLECLICK, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERMOUSEDOUBLECLICK, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_RowHeaderCellChangedDescr) 
        ]
        public event DataGridViewRowEventHandler RowHeaderCellChanged 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERCELLCHANGED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERCELLCHANGED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_RowHeightChangedDescr)
        ] 
        public event DataGridViewRowEventHandler RowHeightChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEIGHTCHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEIGHTCHANGED, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatData),
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_RowHeightInfoNeededDescr)
        ] 
        public event DataGridViewRowHeightInfoNeededEventHandler RowHeightInfoNeeded
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEIGHTINFONEEDED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEIGHTINFONEEDED, value); 
            }
        } 
 
        internal DataGridViewRowHeightInfoNeededEventArgs RowHeightInfoNeededEventArgs
        { 
            get
            {
                if (this.dgvrhine == null)
                { 
                    this.dgvrhine = new DataGridViewRowHeightInfoNeededEventArgs();
                } 
                return this.dgvrhine; 
            }
        } 

        /// 
        [
            SRCategory(SR.CatData), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_RowHeightInfoPushedDescr) 
        ] 
        public event DataGridViewRowHeightInfoPushedEventHandler RowHeightInfoPushed
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEIGHTINFOPUSHED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEIGHTINFOPUSHED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatFocus), 
            SRDescription(SR.DataGridView_RowLeaveDescr)
        ] 
        public event DataGridViewCellEventHandler RowLeave 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWLEAVE, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWLEAVE, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_RowMinimumHeightChangedDescr) 
        ]
        public event DataGridViewRowEventHandler RowMinimumHeightChanged 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWMINIMUMHEIGHTCHANGED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWMINIMUMHEIGHTCHANGED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatDisplay),
            SRDescription(SR.DataGridView_RowPostPaintDescr)
        ] 
        public event DataGridViewRowPostPaintEventHandler RowPostPaint
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWPOSTPAINT, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWPOSTPAINT, value); 
            }
        } 
 
        internal DataGridViewRowPostPaintEventArgs RowPostPaintEventArgs
        { 
            get
            {
                if (this.dgvrpope == null)
                { 
                    this.dgvrpope = new DataGridViewRowPostPaintEventArgs(this);
                } 
                return this.dgvrpope; 
            }
        } 

        /// 
        [
            SRCategory(SR.CatDisplay), 
            SRDescription(SR.DataGridView_RowPrePaintDescr)
        ] 
        public event DataGridViewRowPrePaintEventHandler RowPrePaint 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWPREPAINT, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWPREPAINT, value); 
            } 
        }
 
        internal DataGridViewRowPrePaintEventArgs RowPrePaintEventArgs
        {
            get
            { 
                if (this.dgvrprpe == null)
                { 
                    this.dgvrprpe = new DataGridViewRowPrePaintEventArgs(this); 
                }
                return this.dgvrprpe; 
            }
        }

        ///  
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_RowsAddedDescr) 
        ]
        public event DataGridViewRowsAddedEventHandler RowsAdded 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWSADDED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWSADDED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatAction),
            SRDescription(SR.DataGridView_RowsRemovedDescr) 
        ] 
        public event DataGridViewRowsRemovedEventHandler RowsRemoved
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWSREMOVED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWSREMOVED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_RowStateChangedDescr)
        ] 
        public event DataGridViewRowStateChangedEventHandler RowStateChanged 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWSTATECHANGED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWSTATECHANGED, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatBehavior),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            SRDescription(SR.DataGridView_RowUnsharedDescr)
        ] 
        public event DataGridViewRowEventHandler RowUnshared 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWUNSHARED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWUNSHARED, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatFocus),
            SRDescription(SR.DataGridView_RowValidatedDescr) 
        ]
        public event DataGridViewCellEventHandler RowValidated 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWVALIDATED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWVALIDATED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatFocus),
            SRDescription(SR.DataGridView_RowValidatingDescr)
        ] 
        public event DataGridViewCellCancelEventHandler RowValidating
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWVALIDATING, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWVALIDATING, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatAction),
            SRDescription(SR.DataGridView_ScrollDescr)
        ]
        public event ScrollEventHandler Scroll 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWSCROLL, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWSCROLL, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_SelectionChangedDescr)
        ]
        public event EventHandler SelectionChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWSELECTIONCHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWSELECTIONCHANGED, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatData),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            SRDescription(SR.DataGridView_SortCompareDescr)
        ]
        public event DataGridViewSortCompareEventHandler SortCompare
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWSORTCOMPARE, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWSORTCOMPARE, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatData),
            SRDescription(SR.DataGridView_SortedDescr) 
        ]
        public event EventHandler Sorted
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWSORTED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWSORTED, value);
            }
        }
 
        /// 
        ///  
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Never) 
        ]
        new public event EventHandler StyleChanged
        {
            add 
            {
                base.StyleChanged += value; 
            } 
            remove
            { 
                base.StyleChanged -= value;
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_UserAddedRowDescr)
        ] 
        public event DataGridViewRowEventHandler UserAddedRow
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWUSERADDEDROW, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWUSERADDEDROW, value); 
            }
        }

        /*///  
        /// 
        public event DataGridViewRowCancelEventHandler UserAddingRow 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWUSERADDINGROW, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWUSERADDINGROW, value);
            } 
        }*/ 

        ///  
        [
            SRCategory(SR.CatAction),
            SRDescription(SR.DataGridView_UserDeletedRowDescr)
        ] 
        public event DataGridViewRowEventHandler UserDeletedRow
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWUSERDELETEDROW, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWUSERDELETEDROW, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatAction),
            SRDescription(SR.DataGridView_UserDeletingRowDescr)
        ]
        public event DataGridViewRowCancelEventHandler UserDeletingRow 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWUSERDELETINGROW, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWUSERDELETINGROW, value);
            } 
        }
 
        //////////////////////// 
        //                    //
        // ISupportInitialize // 
        //                    //
        ////////////////////////
        [
            SuppressMessage("Microsoft.Design", "CA1033:InterfaceMethodsShouldBeCallableByChildTypes") // VSWhidbey 405004 
        ]
        void ISupportInitialize.BeginInit() 
        { 
            if (this.dataGridViewState2[DATAGRIDVIEWSTATE2_initializing])
            { 
                throw new InvalidOperationException(SR.GetString(SR.DataGridViewBeginInit));
            }

            this.dataGridViewState2[DATAGRIDVIEWSTATE2_initializing] = true; 
        }
 
        [ 
            SuppressMessage("Microsoft.Design", "CA1033:InterfaceMethodsShouldBeCallableByChildTypes") // VSWhidbey 405004
        ] 
        void ISupportInitialize.EndInit()
        {
            this.dataGridViewState2[DATAGRIDVIEWSTATE2_initializing] = false;
 
            foreach (DataGridViewColumn dataGridViewColumn in this.Columns)
            { 
                if (dataGridViewColumn.Frozen && 
                    dataGridViewColumn.Visible &&
                    dataGridViewColumn.InheritedAutoSizeMode == DataGridViewAutoSizeColumnMode.Fill) 
                {
                    dataGridViewColumn.AutoSizeMode = DataGridViewAutoSizeColumnMode.None;
                }
            } 

            DataGridViewSelectionMode selectionMode = this.SelectionMode; 
            if (selectionMode == DataGridViewSelectionMode.FullColumnSelect || selectionMode == DataGridViewSelectionMode.ColumnHeaderSelect) 
            {
                foreach (DataGridViewColumn dataGridViewColumn in this.Columns) 
                {
                    if (dataGridViewColumn.SortMode == DataGridViewColumnSortMode.Automatic)
                    {
                        // Resetting SelectionMode to its acceptable default value. We don't want the control to ever end up in an invalid state. 
                        this.SelectionMode = defaultSelectionMode; // DataGridViewSelectionMode.RowHeaderSelect
                        throw new InvalidOperationException(SR.GetString(SR.DataGridView_SelectionModeReset, 
                                                                         SR.GetString(SR.DataGridView_SelectionModeAndSortModeClash, (selectionMode).ToString()), 
                                                                         (defaultSelectionMode).ToString()));
                    } 
                }
            }
        }
 
        /* INTERNAL ENUMERATIONS */
 
        internal enum DataGridViewHitTestTypeInternal 
        {
            None, 
            Cell,
            ColumnHeader,
            RowHeader,
            ColumnResizeLeft, 
            ColumnResizeRight,
            RowResizeTop, 
            RowResizeBottom, 
            FirstColumnHeaderLeft,
            TopLeftHeader, 
            TopLeftHeaderResizeLeft,
            TopLeftHeaderResizeRight,
            TopLeftHeaderResizeTop,
            TopLeftHeaderResizeBottom, 
            ColumnHeadersResizeBottom,
            ColumnHeadersResizeTop, 
            RowHeadersResizeRight, 
            RowHeadersResizeLeft,
            ColumnHeaderLeft, 
            ColumnHeaderRight
        }

        internal enum DataGridViewValidateCellInternal 
        {
            Never, 
            Always, 
            WhenChanged
        } 

        private enum DataGridViewMouseEvent
        {
            Click, 
            DoubleClick,
            MouseClick, 
            MouseDoubleClick, 
            MouseDown,
            MouseUp, 
            MouseMove
        }

        private struct MouseClickInfo 
        {
            public MouseButtons button; 
            public long timeStamp; 
            public int x;
            public int y; 
            public int col;
            public int row;
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms 
{ 
    using System.Text;
    using System.Runtime.InteropServices; 
    using System.Runtime.Remoting;
    using System.ComponentModel;
    using System;
    using System.Diagnostics.CodeAnalysis; 
    using System.Security;
    using System.Security.Permissions; 
    using System.Collections; 
    using System.Windows.Forms;
    using System.Windows.Forms.Design; 
    using System.ComponentModel.Design;
    using System.Drawing;
    using System.Windows.Forms.ComponentModel;
    using System.Windows.Forms.Layout; 
    using System.Globalization;
    using System.Diagnostics; 
    using System.Windows.Forms.VisualStyles; 
    using Microsoft.Win32;
    using System.Collections.Specialized; 

    /// 
    [
        ComVisible(true), 
        ClassInterface(ClassInterfaceType.AutoDispatch),
        Designer("System.Windows.Forms.Design.DataGridViewDesigner, " + AssemblyRef.SystemDesign), 
        //DefaultProperty("DataSource"), 
        DefaultEvent("CellContentClick"),
        ComplexBindingProperties("DataSource", "DataMember"), 
        Docking(DockingBehavior.Ask),
        Editor("System.Windows.Forms.Design.DataGridViewComponentEditor, " + AssemblyRef.SystemDesign, typeof(ComponentEditor)),
        SRDescription(SR.DescriptionDataGridView)
    ] 
    public partial class DataGridView : Control, ISupportInitialize
    { 
        private static readonly object EVENT_DATAGRIDVIEWALLOWUSERTOADDROWSCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWALLOWUSERTODELETEROWSCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWALLOWUSERTOORDERCOLUMNSCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWALLOWUSERTORESIZECOLUMNSCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWALLOWUSERTORESIZEROWSCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWALTERNATINGROWSDEFAULTCELLSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWAUTOGENERATECOLUMNSCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWAUTOSIZECOLUMNMODECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWAUTOSIZECOLUMNSMODECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWAUTOSIZEROWSMODECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWBACKGROUNDCOLORCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWBORDERSTYLECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCANCELROWEDIT = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLBEGINEDIT = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLBORDERSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLCLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLCONTENTCLICK = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLCONTENTDOUBLECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLCONTEXTMENUSTRIPCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLCONTEXTMENUSTRIPNEEDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLDOUBLECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLENDEDIT = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLENTER = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLERRORTEXTCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLERRORTEXTNEEDED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLFORMATTING = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLLEAVE = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSEDOUBLECLICK = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSEDOWN = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSEENTER = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSELEAVE = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSEMOVE = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLMOUSEUP = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLPAINTING = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLPARSING = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLSTATECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLSTYLECONTENTCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLTOOLTIPTEXTCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLTOOLTIPTEXTNEEDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLVALIDATING = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLVALIDATED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLVALUECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCELLVALUENEEDED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCELLVALUEPUSHED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNADDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNCONTEXTMENUSTRIPCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNDATAPROPERTYNAMECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNDEFAULTCELLSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNDISPLAYINDEXCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNDIVIDERWIDTHCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERCELLCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNDIVIDERDOUBLECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERMOUSECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERMOUSEDOUBLECLICK = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERSBORDERSTYLECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERSDEFAULTCELLSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERSHEIGHTCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNHEADERSHEIGHTSIZEMODECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNMINIMUMWIDTHCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNNAMECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNREMOVED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNSORTMODECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNSTATECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNTOOLTIPTEXTCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWCOLUMNWIDTHCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCURRENTCELLCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWCURRENTCELLDIRTYSTATECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWDATABINDINGCOMPLETE = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWDATAERROR = new object();
        private static readonly object EVENT_DATAGRIDVIEWDATAMEMBERCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWDATASOURCECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWDEFAULTCELLSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWDEFAULTVALUESNEEDED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWEDITINGCONTROLSHOWING = new object();
        private static readonly object EVENT_DATAGRIDVIEWEDITMODECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWGRIDCOLORCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWMULTISELECTCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWNEWROWNEEDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWREADONLYCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWCONTEXTMENUSTRIPCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWCONTEXTMENUSTRIPNEEDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWDEFAULTCELLSTYLECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWDIRTYSTATENEEDED = new Object();
        private static readonly object EVENT_DATAGRIDVIEWROWDIVIDERHEIGHTCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWENTER = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWERRORTEXTCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWERRORTEXTNEEDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERCELLCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWDIVIDERDOUBLECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERMOUSECLICK = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERMOUSEDOUBLECLICK = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERSBORDERSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERSDEFAULTCELLSTYLECHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERSWIDTHCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWHEADERSWIDTHSIZEMODECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWHEIGHTCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWHEIGHTINFONEEDED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWHEIGHTINFOPUSHED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWLEAVE = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWMINIMUMHEIGHTCHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWPOSTPAINT = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWPREPAINT = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWSADDED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWSDEFAULTCELLSTYLECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWSREMOVED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWSTATECHANGED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWUNSHARED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWROWVALIDATED = new object();
        private static readonly object EVENT_DATAGRIDVIEWROWVALIDATING = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWSCROLL = new object();
        private static readonly object EVENT_DATAGRIDVIEWSELECTIONCHANGED = new object();
        private static readonly object EVENT_DATAGRIDVIEWSORTCOMPARE = new object();
        private static readonly object EVENT_DATAGRIDVIEWSORTED = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWUSERADDEDROW = new object();
        private static readonly object EVENT_DATAGRIDVIEWUSERDELETEDROW = new object(); 
        private static readonly object EVENT_DATAGRIDVIEWUSERDELETINGROW = new object(); 

        private const int DATAGRIDVIEWSTATE1_allowUserToAddRows           = 0x00000001; 
        private const int DATAGRIDVIEWSTATE1_allowUserToDeleteRows        = 0x00000002;
        private const int DATAGRIDVIEWSTATE1_allowUserToOrderColumns      = 0x00000004;
        private const int DATAGRIDVIEWSTATE1_columnHeadersVisible         = 0x00000008;
        private const int DATAGRIDVIEWSTATE1_rowHeadersVisible            = 0x00000010; 
        private const int DATAGRIDVIEWSTATE1_forwardCharMessage           = 0x00000020;
        private const int DATAGRIDVIEWSTATE1_leavingWithTabKey            = 0x00000040; 
        private const int DATAGRIDVIEWSTATE1_multiSelect                  = 0x00000080; 
        private const int DATAGRIDVIEWSTATE1_ignoringEditingChanges       = 0x00000200;
        private const int DATAGRIDVIEWSTATE1_ambientForeColor             = 0x00000400; 
        private const int DATAGRIDVIEWSTATE1_scrolledSinceMouseDown       = 0x00000800;
        private const int DATAGRIDVIEWSTATE1_editingControlHidden         = 0x00001000;
        private const int DATAGRIDVIEWSTATE1_standardTab                  = 0x00002000;
        private const int DATAGRIDVIEWSTATE1_editingControlChanging       = 0x00004000; 
        private const int DATAGRIDVIEWSTATE1_currentCellInEditMode        = 0x00008000;
        private const int DATAGRIDVIEWSTATE1_virtualMode                  = 0x00010000; 
        private const int DATAGRIDVIEWSTATE1_editedCellChanged            = 0x00020000; 
        private const int DATAGRIDVIEWSTATE1_editedRowChanged             = 0x00040000;
        private const int DATAGRIDVIEWSTATE1_newRowEdited                 = 0x00080000; 
        private const int DATAGRIDVIEWSTATE1_readOnly                     = 0x00100000;
        private const int DATAGRIDVIEWSTATE1_newRowCreatedByEditing       = 0x00200000;
        private const int DATAGRIDVIEWSTATE1_temporarilyResetCurrentCell  = 0x00400000;
        private const int DATAGRIDVIEWSTATE1_autoGenerateColumns          = 0x00800000; 
        private const int DATAGRIDVIEWSTATE1_customCursorSet              = 0x01000000;
        private const int DATAGRIDVIEWSTATE1_ambientFont                  = 0x02000000; 
        private const int DATAGRIDVIEWSTATE1_ambientColumnHeadersFont     = 0x04000000; 
        private const int DATAGRIDVIEWSTATE1_ambientRowHeadersFont        = 0x08000000;
        private const int DATAGRIDVIEWSTATE1_isRestrictedChecked          = 0x10000000; 
        private const int DATAGRIDVIEWSTATE1_isRestricted                 = 0x20000000;
        private const int DATAGRIDVIEWSTATE1_isAutoSized                  = 0x40000000;

        // DATAGRIDVIEWSTATE2_ 
        private const int DATAGRIDVIEWSTATE2_showEditingIcon               = 0x00000001;
        private const int DATAGRIDVIEWSTATE2_allowUserToResizeColumns      = 0x00000002; 
        private const int DATAGRIDVIEWSTATE2_allowUserToResizeRows         = 0x00000004; 
        private const int DATAGRIDVIEWSTATE2_mouseOverRemovedEditingCtrl   = 0x00000008;
        private const int DATAGRIDVIEWSTATE2_mouseOverRemovedEditingPanel  = 0x00000010; 
        private const int DATAGRIDVIEWSTATE2_mouseEnterExpected            = 0x00000020;
        private const int DATAGRIDVIEWSTATE2_enableHeadersVisualStyles     = 0x00000040;
        private const int DATAGRIDVIEWSTATE2_showCellErrors                = 0x00000080;
        private const int DATAGRIDVIEWSTATE2_showCellToolTips              = 0x00000100; 
        private const int DATAGRIDVIEWSTATE2_showRowErrors                 = 0x00000200;
        private const int DATAGRIDVIEWSTATE2_showColumnRelocationInsertion = 0x00000400; 
        private const int DATAGRIDVIEWSTATE2_rightToLeftMode               = 0x00000800; 
        private const int DATAGRIDVIEWSTATE2_rightToLeftValid              = 0x00001000;
        private const int DATAGRIDVIEWSTATE2_currentCellWantsInputKey      = 0x00002000; 
        private const int DATAGRIDVIEWSTATE2_stopRaisingVerticalScroll     = 0x00004000;
        private const int DATAGRIDVIEWSTATE2_stopRaisingHorizontalScroll   = 0x00008000;
        private const int DATAGRIDVIEWSTATE2_replacedCellSelected          = 0x00010000;
        private const int DATAGRIDVIEWSTATE2_replacedCellReadOnly          = 0x00020000; 
        private const int DATAGRIDVIEWSTATE2_raiseSelectionChanged         = 0x00040000;
        private const int DATAGRIDVIEWSTATE2_initializing                  = 0x00080000; 
        private const int DATAGRIDVIEWSTATE2_autoSizedWithoutHandle        = 0x00100000; 
        private const int DATAGRIDVIEWSTATE2_ignoreCursorChange            = 0x00200000;
        private const int DATAGRIDVIEWSTATE2_rowsCollectionClearedInSetCell= 0x00400000; 
        private const int DATAGRIDVIEWSTATE2_nextMouseUpIsDouble           = 0x00800000;
        private const int DATAGRIDVIEWSTATE2_inBindingContextChanged       = 0x01000000;
        private const int DATAGRIDVIEWSTATE2_allowHorizontalScrollbar      = 0x02000000;
        private const int DATAGRIDVIEWSTATE2_usedFillWeightsDirty          = 0x04000000; 
        private const int DATAGRIDVIEWSTATE2_messageFromEditingCtrls       = 0x08000000;
        private const int DATAGRIDVIEWSTATE2_cellMouseDownInContentBounds  = 0x10000000; 
        private const int DATAGRIDVIEWSTATE2_discardEditingControl         = 0x20000000; 

        // DATAGRIDVIEWOPER_ 
        private const int DATAGRIDVIEWOPER_trackColResize                = 0x00000001;
        private const int DATAGRIDVIEWOPER_trackRowResize                = 0x00000002;
        private const int DATAGRIDVIEWOPER_trackColSelect                = 0x00000004;
        private const int DATAGRIDVIEWOPER_trackRowSelect                = 0x00000008; 
        private const int DATAGRIDVIEWOPER_trackCellSelect               = 0x00000010;
        private const int DATAGRIDVIEWOPER_trackColRelocation            = 0x00000020; 
        private const int DATAGRIDVIEWOPER_inSort                        = 0x00000040; 
        private const int DATAGRIDVIEWOPER_trackColHeadersResize         = 0x00000080;
        private const int DATAGRIDVIEWOPER_trackRowHeadersResize         = 0x00000100; 
        private const int DATAGRIDVIEWOPER_trackMouseMoves               = 0x00000200;
        private const int DATAGRIDVIEWOPER_inRefreshColumns              = 0x00000400;
        private const int DATAGRIDVIEWOPER_inDisplayIndexAdjustments     = 0x00000800;
        private const int DATAGRIDVIEWOPER_lastEditCtrlClickDoubled      = 0x00001000; 
        private const int DATAGRIDVIEWOPER_inMouseDown                   = 0x00002000;
        private const int DATAGRIDVIEWOPER_inReadOnlyChange              = 0x00004000; 
        private const int DATAGRIDVIEWOPER_inCellValidating              = 0x00008000; 
        private const int DATAGRIDVIEWOPER_inBorderStyleChange           = 0x00010000;
        private const int DATAGRIDVIEWOPER_inCurrentCellChange           = 0x00020000; 
        private const int DATAGRIDVIEWOPER_inAdjustFillingColumns        = 0x00040000;
        private const int DATAGRIDVIEWOPER_inAdjustFillingColumn         = 0x00080000;
        private const int DATAGRIDVIEWOPER_inDispose                     = 0x00100000;
        private const int DATAGRIDVIEWOPER_inBeginEdit                   = 0x00200000; 
        private const int DATAGRIDVIEWOPER_inEndEdit                     = 0x00400000;
        private const int DATAGRIDVIEWOPER_resizingOperationAboutToStart = 0x00800000; 
 
        private static Size DragSize = SystemInformation.DragSize;
 
        private const byte DATAGRIDVIEW_columnSizingHotZone = 6;
        private const byte DATAGRIDVIEW_rowSizingHotZone = 5;
        private const byte DATAGRIDVIEW_insertionBarWidth = 3;
        private const byte DATAGRIDVIEW_bulkPaintThreshold = 8; 

        private const string DATAGRIDVIEW_htmlPrefix = "Version:1.0\r\nStartHTML:00000097\r\nEndHTML:{0}\r\nStartFragment:00000133\r\nEndFragment:{1}\r\n"; 
        private const string DATAGRIDVIEW_htmlStartFragment = "\r\n\r\n"; 
        private const string DATAGRIDVIEW_htmlEndFragment = "\r\n\r\n\r\n";
 
        private System.Collections.Specialized.BitVector32 dataGridViewState1;  // see DATAGRIDVIEWSTATE1_ consts above
        private System.Collections.Specialized.BitVector32 dataGridViewState2;  // see DATAGRIDVIEWSTATE2_ consts above
        private System.Collections.Specialized.BitVector32 dataGridViewOper;   // see DATAGRIDVIEWOPER_ consts above
 
        private const BorderStyle defaultBorderStyle = BorderStyle.FixedSingle;
        private const DataGridViewAdvancedCellBorderStyle defaultAdvancedCellBorderStyle = DataGridViewAdvancedCellBorderStyle.Single; 
        private const DataGridViewAdvancedCellBorderStyle defaultAdvancedRowHeadersBorderStyle = DataGridViewAdvancedCellBorderStyle.OutsetPartial; 
        private const DataGridViewAdvancedCellBorderStyle defaultAdvancedColumnHeadersBorderStyle = DataGridViewAdvancedCellBorderStyle.OutsetPartial;
 
        private const DataGridViewSelectionMode defaultSelectionMode = DataGridViewSelectionMode.RowHeaderSelect;
        private const DataGridViewEditMode defaultEditMode = DataGridViewEditMode.EditOnKeystrokeOrF2;

        private const DataGridViewAutoSizeRowCriteriaInternal invalidDataGridViewAutoSizeRowCriteriaInternalMask = ~(DataGridViewAutoSizeRowCriteriaInternal.Header | DataGridViewAutoSizeRowCriteriaInternal.AllColumns); 

        private SolidBrush backgroundBrush = DefaultBackgroundBrush; 
        private Pen gridPen; 
        private Cursor oldCursor;
 
        private Graphics cachedGraphics;

        private HScrollBar horizScrollBar = new HScrollBar();
        private VScrollBar vertScrollBar = new VScrollBar(); 
        private DataGridViewHeaderCell topLeftHeaderCell;
 
        private DataGridViewRow rowTemplate; 
        private DataGridViewRowCollection dataGridViewRows;
        private DataGridViewColumnCollection dataGridViewColumns; 

        private DataGridViewCellStyle placeholderCellStyle;
        private StringFormat placeholderStringFormat;
 
        private DataGridViewColumn sortedColumn;
        private SortOrder sortOrder; 
 
        private object uneditedFormattedValue;
        private Control editingControl, latestEditingControl, cachedEditingControl; 
        private Panel editingPanel;
        private Point ptCurrentCell, ptCurrentCellCache = Point.Empty, ptAnchorCell, ptMouseDownCell, ptMouseEnteredCell, ptToolTipCell, ptMouseDownGridCoord;

        private DataGridViewSelectionMode selectionMode; 
        private DataGridViewEditMode editMode;
 
        // Note that a cell can only be in one bag but not both at the same time. 
        private DataGridViewCellLinkedList individualSelectedCells;
        private DataGridViewCellLinkedList individualReadOnlyCells; 
        private DataGridViewIntLinkedList selectedBandIndexes;
        private DataGridViewIntLinkedList selectedBandSnapshotIndexes;

        private DataGridViewCellStyle defaultCellStyle, columnHeadersDefaultCellStyle, rowHeadersDefaultCellStyle; 
        private DataGridViewCellStyle rowsDefaultCellStyle, alternatingRowsDefaultCellStyle;
        private ScrollBars scrollBars; 
        private LayoutData layout; 
        private DisplayedBandsData displayedBandsInfo;
        private Rectangle normalClientRectangle; 
        private ArrayList lstRows;
        private int availableWidthForFillColumns;

        private BorderStyle borderStyle; 
        private DataGridViewAdvancedBorderStyle advancedCellBorderStyle;
        private DataGridViewAdvancedBorderStyle advancedRowHeadersBorderStyle; 
        private DataGridViewAdvancedBorderStyle advancedColumnHeadersBorderStyle; 

        private DataGridViewClipboardCopyMode clipboardCopyMode; 

        private const int minimumRowHeadersWidth = 4;
        private const int minimumColumnHeadersHeight = 4;
        private const int defaultRowHeadersWidth = 41; 
        private const int maxHeadersThickness = 32768;
        private const int upperSize = 0x007FFFFF; 
        private int rowHeadersWidth = defaultRowHeadersWidth; 
        private int cachedRowHeadersWidth;
        private const int defaultColumnHeadersHeight = 23; 
        private int columnHeadersHeight = defaultColumnHeadersHeight;
        private int cachedColumnHeadersHeight;
        private DataGridViewAutoSizeRowsMode autoSizeRowsMode;
        private DataGridViewAutoSizeColumnsMode autoSizeColumnsMode; 
        private DataGridViewColumnHeadersHeightSizeMode columnHeadersHeightSizeMode;
        private DataGridViewRowHeadersWidthSizeMode rowHeadersWidthSizeMode; 
 
        private DataGridViewCellStyleChangedEventArgs dgvcsce;
        private DataGridViewCellPaintingEventArgs dgvcpe; 
        private DataGridViewCellValueEventArgs dgvcve;
        private DataGridViewRowHeightInfoNeededEventArgs dgvrhine;
        private DataGridViewRowPostPaintEventArgs dgvrpope;
        private DataGridViewRowPrePaintEventArgs dgvrprpe; 

        // the sum of the widths in pixels of the scrolling columns preceding 
        // the first visible scrolling column 
        private int horizontalOffset;
 
        // the sum of the heights in pixels of the scrolling rows preceding
        // the first visible scrolling row
        private int verticalOffset;
 
        // the number of pixels of the firstDisplayedScrollingCol which are not visible
        private int negOffset; 
 
        // the index of the potential 'new' row. -1 if there is no 'new' row.
        private int newRowIndex = -1; 

        // residual fraction of WHEEL_DELTA (120) for wheel scrolling
        private int cumulativeVerticalWheelDelta;
        private int cumulativeHorizontalWheelDelta; 

        private int trackColAnchor; 
        private int trackColumn = -1; 
        private int trackColumnEdge = -1;
        private int trackRowAnchor; 
        private int trackRow = -1;
        private int trackRowEdge = -1;
        private int lastHeaderShadow = -1;
        private int currentColSplitBar = -1, lastColSplitBar = -1; 
        private int currentRowSplitBar = -1, lastRowSplitBar = -1;
        private int mouseBarOffset; 
        private int noDimensionChangeCount; 
        private int noSelectionChangeCount;
        private int noAutoSizeCount; 
        private int inBulkPaintCount;
        private int inBulkLayoutCount;
        private int inPerformLayoutCount;
 
        private System.Windows.Forms.Timer vertScrollTimer, horizScrollTimer;
 
        private Hashtable converters; 
        private Hashtable pens;
        private Hashtable brushes; 

        private NativeMethods.RECT[] cachedScrollableRegion;

        // DataBinding 
        private DataGridViewDataConnection dataConnection;
 
        // ToolTip 
        private DataGridViewToolTip toolTipControl;
        // the tool tip string we get from cells 
        private string toolTipCaption = String.Empty;

        private const int maxTTDISPINFOBufferLength = 80;
 
        // Last Mouse Click Info
        private MouseClickInfo lastMouseClickInfo; 
 
#if DEBUG
        // set to false when the grid is not in [....] with the underlying data store 
        // in virtual mode, and OnCellValueNeeded cannot be called.
        internal bool dataStoreAccessAllowed = true;
#endif
        ///  
        /// 
        /// Initializes a new instance of the  class. 
        ///  
        public DataGridView()
        { 
            SetStyle(ControlStyles.UserPaint |
                     ControlStyles.Opaque |
                     ControlStyles.UserMouse, true);
 
            SetStyle(ControlStyles.SupportsTransparentBackColor, false);
 
            // this class overrides GetPreferredSizeCore, let Control automatically cache the result 
            SetState2(STATE2_USEPREFERREDSIZECACHE, true);
 
            this.dataGridViewState1 = new System.Collections.Specialized.BitVector32(0x00000000);
            this.dataGridViewState2 = new System.Collections.Specialized.BitVector32(0x00000000);
            this.dataGridViewOper   = new System.Collections.Specialized.BitVector32(0x00000000);
 
            this.dataGridViewState1[  DATAGRIDVIEWSTATE1_columnHeadersVisible
                                    | DATAGRIDVIEWSTATE1_rowHeadersVisible 
                                    | DATAGRIDVIEWSTATE1_autoGenerateColumns 
                                    | DATAGRIDVIEWSTATE1_allowUserToAddRows
                                    | DATAGRIDVIEWSTATE1_allowUserToDeleteRows ] = true; 



            this.dataGridViewState2[  DATAGRIDVIEWSTATE2_showEditingIcon 
                                    | DATAGRIDVIEWSTATE2_enableHeadersVisualStyles
                                    | DATAGRIDVIEWSTATE2_mouseEnterExpected 
                                    | DATAGRIDVIEWSTATE2_allowUserToResizeColumns 
                                    | DATAGRIDVIEWSTATE2_allowUserToResizeRows
                                    | DATAGRIDVIEWSTATE2_showCellToolTips 
                                    | DATAGRIDVIEWSTATE2_showCellErrors
                                    | DATAGRIDVIEWSTATE2_showRowErrors
                                    | DATAGRIDVIEWSTATE2_allowHorizontalScrollbar
                                    | DATAGRIDVIEWSTATE2_usedFillWeightsDirty ] = true; 

 
            this.displayedBandsInfo = new DisplayedBandsData(); 
            this.lstRows = new ArrayList();
 
            this.converters = new Hashtable(8);
            this.pens = new Hashtable(8);
            this.brushes = new Hashtable(10);
            this.gridPen = new Pen(DefaultGridColor); 

            this.selectedBandIndexes = new DataGridViewIntLinkedList(); 
            this.individualSelectedCells = new DataGridViewCellLinkedList(); 
            this.individualReadOnlyCells = new DataGridViewCellLinkedList();
 
            this.advancedCellBorderStyle = new DataGridViewAdvancedBorderStyle(this,
                DataGridViewAdvancedCellBorderStyle.OutsetDouble,
                DataGridViewAdvancedCellBorderStyle.OutsetPartial,
                DataGridViewAdvancedCellBorderStyle.InsetDouble); 
            this.advancedRowHeadersBorderStyle = new DataGridViewAdvancedBorderStyle(this);
            this.advancedColumnHeadersBorderStyle = new DataGridViewAdvancedBorderStyle(this); 
            this.advancedCellBorderStyle.All = defaultAdvancedCellBorderStyle; 
            this.advancedRowHeadersBorderStyle.All = defaultAdvancedRowHeadersBorderStyle;
            this.advancedColumnHeadersBorderStyle.All = defaultAdvancedColumnHeadersBorderStyle; 
            this.borderStyle = defaultBorderStyle;
            this.dataGridViewState1[DATAGRIDVIEWSTATE1_multiSelect] = true;
            this.selectionMode = defaultSelectionMode;
            this.editMode = defaultEditMode; 
            this.autoSizeRowsMode = DataGridViewAutoSizeRowsMode.None;
            this.autoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None; 
            this.columnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.EnableResizing; 
            this.rowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.EnableResizing;
 
            this.clipboardCopyMode = DataGridViewClipboardCopyMode.EnableWithAutoHeaderText;

            this.layout = new LayoutData();
            this.layout.TopLeftHeader        = Rectangle.Empty; 
            this.layout.ColumnHeaders        = Rectangle.Empty;
            this.layout.RowHeaders           = Rectangle.Empty; 
            this.layout.ColumnHeadersVisible = true; 
            this.layout.RowHeadersVisible    = true;
            this.layout.ClientRectangle      = this.ClientRectangle; 

            this.scrollBars = ScrollBars.Both;

            this.horizScrollBar.RightToLeft = RightToLeft.Inherit; 
            this.horizScrollBar.AccessibleName = SR.GetString(SR.DataGridView_AccHorizontalScrollBarAccName);
            this.horizScrollBar.Top = this.ClientRectangle.Height - horizScrollBar.Height; 
            this.horizScrollBar.Left = 0; 
            this.horizScrollBar.Visible = false;
            this.horizScrollBar.Scroll += new ScrollEventHandler(DataGridViewHScrolled); 
            this.Controls.Add(this.horizScrollBar);

            this.vertScrollBar.Top = 0;
            this.vertScrollBar.AccessibleName = SR.GetString(SR.DataGridView_AccVerticalScrollBarAccName); 
            this.vertScrollBar.Left = this.ClientRectangle.Width - vertScrollBar.Width;
            this.vertScrollBar.Visible = false; 
            this.vertScrollBar.Scroll += new ScrollEventHandler(DataGridViewVScrolled); 
            this.Controls.Add(this.vertScrollBar);
 
            this.ptCurrentCell = new Point(-1, -1);
            this.ptAnchorCell = new Point(-1, -1);
            this.ptMouseDownCell = new Point(-2, -2);
            this.ptMouseEnteredCell = new Point(-2, -2); 
            this.ptToolTipCell = new Point(-1, -1);
            this.ptMouseDownGridCoord = new Point(-1, -1); 
 
            this.sortOrder = SortOrder.None;
 
            this.lastMouseClickInfo.timeStamp = 0;

            WireScrollBarsEvents();
            PerformLayout(); 

            this.toolTipControl = new DataGridViewToolTip(this); 
 
            Invalidate();
        } 

        /// 
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ] 
        public virtual DataGridViewAdvancedBorderStyle AdjustedTopLeftHeaderBorderStyle
        { 
            get
            {
                DataGridViewAdvancedBorderStyle dgvabs;
                if (this.ApplyVisualStylesToHeaderCells) 
                {
                    switch (this.AdvancedColumnHeadersBorderStyle.All) 
                    { 
                        case DataGridViewAdvancedCellBorderStyle.OutsetDouble:
                        case DataGridViewAdvancedCellBorderStyle.OutsetPartial: 
                            dgvabs = new DataGridViewAdvancedBorderStyle();
                            if (this.RightToLeftInternal)
                            {
                                dgvabs.LeftInternal = DataGridViewAdvancedCellBorderStyle.Outset; 
                            }
                            else 
                            { 
                                dgvabs.LeftInternal = DataGridViewAdvancedCellBorderStyle.OutsetDouble;
                            } 
                            dgvabs.RightInternal = DataGridViewAdvancedCellBorderStyle.Outset;
                            dgvabs.TopInternal = DataGridViewAdvancedCellBorderStyle.OutsetDouble;
                            dgvabs.BottomInternal = DataGridViewAdvancedCellBorderStyle.Outset;
                            break; 

                        case DataGridViewAdvancedCellBorderStyle.InsetDouble: 
                            dgvabs = new DataGridViewAdvancedBorderStyle(); 
                            if (this.RightToLeftInternal)
                            { 
                                dgvabs.LeftInternal = DataGridViewAdvancedCellBorderStyle.Inset;
                            }
                            else
                            { 
                                dgvabs.LeftInternal = DataGridViewAdvancedCellBorderStyle.InsetDouble;
                            } 
                            dgvabs.RightInternal = DataGridViewAdvancedCellBorderStyle.Inset; 
                            dgvabs.TopInternal = DataGridViewAdvancedCellBorderStyle.InsetDouble;
                            dgvabs.BottomInternal = DataGridViewAdvancedCellBorderStyle.Inset; 
                            break;

                        case DataGridViewAdvancedCellBorderStyle.NotSet:
                            // Since the row headers are visible, we should make sure 
                            // that there is a left/right border for the TopLeftHeaderCell no matter what.
                            if ((!this.RightToLeftInternal && this.AdvancedColumnHeadersBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.None) || 
                                (this.RightToLeftInternal && this.AdvancedColumnHeadersBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.None)) 
                            {
                                dgvabs = new DataGridViewAdvancedBorderStyle(); 
                                if (this.RightToLeftInternal)
                                {
                                    dgvabs.LeftInternal = this.AdvancedColumnHeadersBorderStyle.Left;
                                    dgvabs.RightInternal = this.AdvancedRowHeadersBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.OutsetDouble ? 
                                        DataGridViewAdvancedCellBorderStyle.Outset : this.AdvancedRowHeadersBorderStyle.Right;
                                } 
                                else 
                                {
                                    dgvabs.LeftInternal = this.AdvancedRowHeadersBorderStyle.Left; 
                                    dgvabs.RightInternal = this.AdvancedColumnHeadersBorderStyle.Right;
                                }
                                dgvabs.TopInternal = this.AdvancedColumnHeadersBorderStyle.Top;
                                dgvabs.BottomInternal = this.AdvancedColumnHeadersBorderStyle.Bottom; 
                            }
                            else 
                            { 
                                dgvabs = this.AdvancedColumnHeadersBorderStyle;
                            } 
                            break;

                        default:
                            dgvabs = this.AdvancedColumnHeadersBorderStyle; 
                            break;
                    } 
                } 
                else
                { 
                    switch (this.AdvancedColumnHeadersBorderStyle.All)
                    {
                        case DataGridViewAdvancedCellBorderStyle.OutsetDouble:
                        case DataGridViewAdvancedCellBorderStyle.OutsetPartial: 
                            dgvabs = new DataGridViewAdvancedBorderStyle();
                            dgvabs.LeftInternal = this.RightToLeftInternal ? DataGridViewAdvancedCellBorderStyle.Outset : DataGridViewAdvancedCellBorderStyle.OutsetDouble; 
                            dgvabs.RightInternal = this.RightToLeftInternal ? DataGridViewAdvancedCellBorderStyle.OutsetDouble : DataGridViewAdvancedCellBorderStyle.Outset; 
                            dgvabs.TopInternal = DataGridViewAdvancedCellBorderStyle.OutsetDouble;
                            dgvabs.BottomInternal = DataGridViewAdvancedCellBorderStyle.Outset; 
                            break;

                        case DataGridViewAdvancedCellBorderStyle.InsetDouble:
                            dgvabs = new DataGridViewAdvancedBorderStyle(); 
                            dgvabs.LeftInternal = this.RightToLeftInternal ? DataGridViewAdvancedCellBorderStyle.Inset : DataGridViewAdvancedCellBorderStyle.InsetDouble;
                            dgvabs.RightInternal = this.RightToLeftInternal ? DataGridViewAdvancedCellBorderStyle.InsetDouble : DataGridViewAdvancedCellBorderStyle.Inset; 
                            dgvabs.TopInternal = DataGridViewAdvancedCellBorderStyle.InsetDouble; 
                            dgvabs.BottomInternal = DataGridViewAdvancedCellBorderStyle.Inset;
                            break; 

                        case DataGridViewAdvancedCellBorderStyle.NotSet:
                            // Since the row headers are visible, we should make sure
                            // that there is a left/right border for the TopLeftHeaderCell no matter what. 
                            if ((!this.RightToLeftInternal && this.AdvancedColumnHeadersBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.None) ||
                                (this.RightToLeftInternal && this.AdvancedColumnHeadersBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.None)) 
                            { 
                                dgvabs = new DataGridViewAdvancedBorderStyle();
                                if (this.RightToLeftInternal) 
                                {
                                    dgvabs.LeftInternal = this.AdvancedColumnHeadersBorderStyle.Left;
                                    dgvabs.RightInternal = this.AdvancedRowHeadersBorderStyle.Right;
                                } 
                                else
                                { 
                                    dgvabs.LeftInternal = this.AdvancedRowHeadersBorderStyle.Left; 
                                    dgvabs.RightInternal = this.AdvancedColumnHeadersBorderStyle.Right;
                                } 
                                dgvabs.TopInternal = this.AdvancedColumnHeadersBorderStyle.Top;
                                dgvabs.BottomInternal = this.AdvancedColumnHeadersBorderStyle.Bottom;
                            }
                            else 
                            {
                                dgvabs = this.AdvancedColumnHeadersBorderStyle; 
                            } 
                            break;
 
                        default:
                            dgvabs = this.AdvancedColumnHeadersBorderStyle;
                            break;
                    } 
                }
                return dgvabs; 
            } 
        }
 
        /// 
        [
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ]
        public DataGridViewAdvancedBorderStyle AdvancedCellBorderStyle 
        { 
            get
            { 
                return this.advancedCellBorderStyle;
            }
        }
 
        /// 
        [ 
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced)
        ] 
        public DataGridViewAdvancedBorderStyle AdvancedColumnHeadersBorderStyle
        {
            get
            { 
                return this.advancedColumnHeadersBorderStyle;
            } 
        } 

        ///  
        [
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Advanced)
        ] 
        public DataGridViewAdvancedBorderStyle AdvancedRowHeadersBorderStyle
        { 
            get 
            {
                return this.advancedRowHeadersBorderStyle; 
            }
        }

        ///  
        [
            DefaultValue(true), 
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_AllowUserToAddRowsDescr)
        ] 
        public bool AllowUserToAddRows
        {
            get
            { 
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_allowUserToAddRows];
            } 
            set 
            {
                if (this.AllowUserToAddRows != value) 
                {
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_allowUserToAddRows] = value;
                    if (this.DataSource != null)
                    { 
                        this.dataConnection.ResetCachedAllowUserToAddRowsInternal();
                    } 
                    OnAllowUserToAddRowsChanged(EventArgs.Empty); 
                }
            } 
        }

        internal bool AllowUserToAddRowsInternal
        { 
            get
            { 
                if (this.DataSource == null) 
                {
                    return this.AllowUserToAddRows; 
                }
                else
                {
                    return this.AllowUserToAddRows && this.dataConnection.AllowAdd; 
                }
            } 
        } 

        ///  
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewOnAllowUserToAddRowsChangedDescr)
        ] 
        public event EventHandler AllowUserToAddRowsChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWALLOWUSERTOADDROWSCHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWALLOWUSERTOADDROWSCHANGED, value); 
            }
        } 
 
        /// 
        [ 
            DefaultValue(true),
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_AllowUserToDeleteRowsDescr)
        ] 
        public bool AllowUserToDeleteRows
        { 
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_allowUserToDeleteRows]; 
            }
            set
            {
                if (this.AllowUserToDeleteRows != value) 
                {
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_allowUserToDeleteRows] = value; 
                    OnAllowUserToDeleteRowsChanged(EventArgs.Empty); 
                }
            } 
        }

        internal bool AllowUserToDeleteRowsInternal
        { 
            get
            { 
                if (this.DataSource == null) 
                {
                    return this.AllowUserToDeleteRows; 
                }
                else
                {
                    return this.AllowUserToDeleteRows && this.dataConnection.AllowRemove; 
                }
            } 
        } 

        ///  
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewOnAllowUserToDeleteRowsChangedDescr)
        ] 
        public event EventHandler AllowUserToDeleteRowsChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWALLOWUSERTODELETEROWSCHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWALLOWUSERTODELETEROWSCHANGED, value); 
            }
        } 
 
        /// 
        [ 
            DefaultValue(false),
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_AllowUserToOrderColumnsDescr)
        ] 
        public bool AllowUserToOrderColumns
        { 
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_allowUserToOrderColumns]; 
            }
            set
            {
                if (this.AllowUserToOrderColumns != value) 
                {
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_allowUserToOrderColumns] = value; 
                    OnAllowUserToOrderColumnsChanged(EventArgs.Empty); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewOnAllowUserToOrderColumnsChangedDescr) 
        ] 
        public event EventHandler AllowUserToOrderColumnsChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWALLOWUSERTOORDERCOLUMNSCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWALLOWUSERTOORDERCOLUMNSCHANGED, value); 
            }
        } 

        /// 
        /// 
        ///     
        ///       Gets or sets a global value indicating if the dataGridView's columns are resizable with the mouse.
        ///       The resizable aspect of a column can be overridden by DataGridViewColumn.Resizable. 
        ///     
        /// 
        [ 
            DefaultValue(true),
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_AllowUserToResizeColumnsDescr)
        ] 
        public bool AllowUserToResizeColumns
        { 
            get 
            {
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_allowUserToResizeColumns]; 
            }
            set
            {
                if (this.AllowUserToResizeColumns != value) 
                {
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_allowUserToResizeColumns] = value; 
                    OnAllowUserToResizeColumnsChanged(EventArgs.Empty); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewOnAllowUserToResizeColumnsChangedDescr) 
        ] 
        public event EventHandler AllowUserToResizeColumnsChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWALLOWUSERTORESIZECOLUMNSCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWALLOWUSERTORESIZECOLUMNSCHANGED, value); 
            }
        } 

        /// 
        /// 
        ///     
        ///       Gets or sets a global value indicating if the dataGridView's rows are resizable with the mouse.
        ///       The resizable aspect of a row can be overridden by DataGridViewRow.Resizable. 
        ///     
        /// 
        [ 
            DefaultValue(true),
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_AllowUserToResizeRowsDescr)
        ] 
        public bool AllowUserToResizeRows
        { 
            get 
            {
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_allowUserToResizeRows]; 
            }
            set
            {
                if (this.AllowUserToResizeRows != value) 
                {
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_allowUserToResizeRows] = value; 
                    OnAllowUserToResizeRowsChanged(EventArgs.Empty); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewOnAllowUserToResizeRowsChangedDescr) 
        ] 
        public event EventHandler AllowUserToResizeRowsChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWALLOWUSERTORESIZEROWSCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWALLOWUSERTORESIZEROWSCHANGED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_AlternatingRowsDefaultCellStyleDescr)
        ] 
        public DataGridViewCellStyle AlternatingRowsDefaultCellStyle 
        {
            get 
            {
                if (this.alternatingRowsDefaultCellStyle == null)
                {
                    this.alternatingRowsDefaultCellStyle = new DataGridViewCellStyle(); 
                    this.alternatingRowsDefaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.AlternatingRows);
                } 
                return this.alternatingRowsDefaultCellStyle; 
            }
            set 
            {
                DataGridViewCellStyle cs = this.AlternatingRowsDefaultCellStyle;
                cs.RemoveScope(DataGridViewCellStyleScopes.AlternatingRows);
                this.alternatingRowsDefaultCellStyle = value; 
                if (value != null)
                { 
                    this.alternatingRowsDefaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.AlternatingRows); 
                }
                DataGridViewCellStyleDifferences dgvcsc = cs.GetDifferencesFrom(this.AlternatingRowsDefaultCellStyle); 
                if (dgvcsc != DataGridViewCellStyleDifferences.None)
                {
                    this.CellStyleChangedEventArgs.ChangeAffectsPreferredSize = (dgvcsc == DataGridViewCellStyleDifferences.AffectPreferredSize);
                    OnAlternatingRowsDefaultCellStyleChanged(this.CellStyleChangedEventArgs); 
                }
            } 
        } 

        ///  
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewAlternatingRowsDefaultCellStyleChangedDescr)
        ] 
        public event EventHandler AlternatingRowsDefaultCellStyleChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWALTERNATINGROWSDEFAULTCELLSTYLECHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWALTERNATINGROWSDEFAULTCELLSTYLECHANGED, value); 
            }
        } 
 
        internal bool ApplyVisualStylesToInnerCells
        { 
            get
            {
                return Application.RenderWithVisualStyles;
            } 
        }
 
        internal bool ApplyVisualStylesToHeaderCells 
        {
            get 
            {
                return Application.RenderWithVisualStyles && this.EnableHeadersVisualStyles;
            }
        } 

        ///  
        ///  
        ///    
        ///     
        /// 
        [
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            DefaultValue(true)
        ] 
        public bool AutoGenerateColumns 
        {
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_autoGenerateColumns];
            }
            set{ 
                if (this.dataGridViewState1[DATAGRIDVIEWSTATE1_autoGenerateColumns] != value)
                { 
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_autoGenerateColumns] = value; 
                    OnAutoGenerateColumnsChanged(EventArgs.Empty);
                } 
            }
        }

        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ]
        public event EventHandler AutoGenerateColumnsChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWAUTOGENERATECOLUMNSCHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWAUTOGENERATECOLUMNSCHANGED, value);
            } 
        }

        /// 
        ///  
        ///     Overriding base implementation for perf gains. 
        ///  
        public override bool AutoSize 
        {
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_isAutoSized];
            }
            set 
            {
                base.AutoSize = value; 
                this.dataGridViewState1[DATAGRIDVIEWSTATE1_isAutoSized] = value; 
            }
        } 

        /// 
        /// 
        ///     Gets or sets the columns' autosizing mode. Standard inheritance model is used: 
        ///           Columns with AutoSizeMode property set to NotSet will use this auto size mode.
        ///     
        ///  
        [
            DefaultValue(DataGridViewAutoSizeColumnsMode.None), 
            SRCategory(SR.CatLayout),
            SRDescription(SR.DataGridView_AutoSizeColumnsModeDescr)
        ]
        public DataGridViewAutoSizeColumnsMode AutoSizeColumnsMode 
        {
            get 
            { 
                return this.autoSizeColumnsMode;
            } 

            set
            {
                switch (value) 
                {
                    case DataGridViewAutoSizeColumnsMode.None: 
                    case DataGridViewAutoSizeColumnsMode.ColumnHeader: 
                    case DataGridViewAutoSizeColumnsMode.AllCellsExceptHeader:
                    case DataGridViewAutoSizeColumnsMode.AllCells: 
                    case DataGridViewAutoSizeColumnsMode.DisplayedCellsExceptHeader:
                    case DataGridViewAutoSizeColumnsMode.DisplayedCells:
                    case DataGridViewAutoSizeColumnsMode.Fill:
                        break; 
                    default:
                        throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewAutoSizeColumnsMode)); 
                 } 

 
                if (this.autoSizeColumnsMode != value)
                {
                    foreach (DataGridViewColumn dataGridViewColumn in this.Columns)
                    { 
                        if (dataGridViewColumn.AutoSizeMode == DataGridViewAutoSizeColumnMode.NotSet && dataGridViewColumn.Visible)
                        { 
                            // Make sure there is no visible column which would have an inherited autosize mode based on the header only. 
                            if (value == DataGridViewAutoSizeColumnsMode.ColumnHeader && !this.ColumnHeadersVisible)
                            { 
                                throw new InvalidOperationException(SR.GetString(SR.DataGridView_CannotAutoSizeColumnsInvisibleColumnHeaders));
                            }
                            // Make sure there is no visible frozen column which would have a Fill inherited autosize mode.
                            if (value == DataGridViewAutoSizeColumnsMode.Fill && dataGridViewColumn.Frozen) 
                            {
                                throw new InvalidOperationException(SR.GetString(SR.DataGridView_CannotAutoFillFrozenColumns)); 
                            } 
                        }
                    } 
                    DataGridViewAutoSizeColumnMode[] previousModes = new DataGridViewAutoSizeColumnMode[this.Columns.Count];
                    foreach (DataGridViewColumn dataGridViewColumn in this.Columns)
                    {
                        /*DataGridViewAutoSizeColumnMode previousInheritedMode = dataGridViewColumn.InheritedAutoSizeMode; 
                        bool previousInheritedModeAutoSized = previousInheritedMode != DataGridViewAutoSizeColumnMode.Fill &&
                                                              previousInheritedMode != DataGridViewAutoSizeColumnMode.None && 
                                                              previousInheritedMode != DataGridViewAutoSizeColumnMode.NotSet;*/ 
                        previousModes[dataGridViewColumn.Index] = dataGridViewColumn.InheritedAutoSizeMode;
                    } 
                    DataGridViewAutoSizeColumnsModeEventArgs dgvcasme = new DataGridViewAutoSizeColumnsModeEventArgs(previousModes);
                    this.autoSizeColumnsMode = value;
                    OnAutoSizeColumnsModeChanged(dgvcasme);
                } 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewAutoSizeColumnsModeChangedDescr)
        ]
        public event DataGridViewAutoSizeColumnsModeEventHandler AutoSizeColumnsModeChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWAUTOSIZECOLUMNSMODECHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWAUTOSIZECOLUMNSMODECHANGED, value);
            } 
        }
 
        ///  
        /// 
        ///     Gets or sets the rows' autosizing mode.  
        /// 
        [
            DefaultValue(DataGridViewAutoSizeRowsMode.None),
            SRCategory(SR.CatLayout), 
            SRDescription(SR.DataGridView_AutoSizeRowsModeDescr)
        ] 
        public DataGridViewAutoSizeRowsMode AutoSizeRowsMode 
        {
            get 
            {
                return this.autoSizeRowsMode;
            }
            set 
            {
                switch (value) 
                { 
                   case DataGridViewAutoSizeRowsMode.None:
                   case DataGridViewAutoSizeRowsMode.AllHeaders: 
                   case DataGridViewAutoSizeRowsMode.AllCellsExceptHeaders:
                   case DataGridViewAutoSizeRowsMode.AllCells:
                   case DataGridViewAutoSizeRowsMode.DisplayedHeaders:
                   case DataGridViewAutoSizeRowsMode.DisplayedCellsExceptHeaders: 
                   case DataGridViewAutoSizeRowsMode.DisplayedCells:
                       break; 
                   default: 
                       throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewAutoSizeRowsMode));
                } 
                if ((value == DataGridViewAutoSizeRowsMode.AllHeaders || value == DataGridViewAutoSizeRowsMode.DisplayedHeaders) &&
                    !this.RowHeadersVisible)
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_CannotAutoSizeRowsInvisibleRowHeader)); 
                }
                if (this.autoSizeRowsMode != value) 
                { 
                    DataGridViewAutoSizeModeEventArgs dgvasme = new DataGridViewAutoSizeModeEventArgs(this.autoSizeRowsMode != DataGridViewAutoSizeRowsMode.None);
                    this.autoSizeRowsMode = value; 
                    OnAutoSizeRowsModeChanged(dgvasme);
                }
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewAutoSizeRowsModeChangedDescr) 
        ]
        public event DataGridViewAutoSizeModeEventHandler AutoSizeRowsModeChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWAUTOSIZEROWSMODECHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWAUTOSIZEROWSMODECHANGED, value);
            }
        }
 
        /// 
        ///  
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Never), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ]
        public override Color BackColor
        { 
            get
            { 
                return base.BackColor; 
            }
            set 
            {
                base.BackColor = value;
            }
        } 

        ///  
        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Never)
        ]
        new public event EventHandler BackColorChanged
        { 
            add
            { 
                base.BackColorChanged += value; 
            }
            remove 
            {
                base.BackColorChanged -= value;
            }
        } 

        internal SolidBrush BackgroundBrush 
        { 
            get
            { 
                return this.backgroundBrush;
            }
        }
 
        /// 
        ///  
        ///    Gets or sets the background color of the dataGridView. 
        /// 
        [ 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridViewBackgroundColorDescr)
        ]
        public Color BackgroundColor 
        {
            get 
            { 
                return this.backgroundBrush.Color;
            } 
            set
            {
                if (value.IsEmpty)
                { 
                    throw new ArgumentException(SR.GetString(SR.DataGridView_EmptyColor, "BackgroundColor"));
                } 
                if (value.A < 255) 
                {
                    throw new ArgumentException(SR.GetString(SR.DataGridView_TransparentColor, "BackgroundColor")); 
                }
                if (!value.Equals(this.backgroundBrush.Color))
                {
                    this.backgroundBrush = new SolidBrush(value); 
                    OnBackgroundColorChanged(EventArgs.Empty);
                } 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewBackgroundColorChangedDescr) 
        ]
        public event EventHandler BackgroundColorChanged 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWBACKGROUNDCOLORCHANGED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWBACKGROUNDCOLORCHANGED, value);
            } 
        } 

        ///  
        [
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Never)
        ] 
        public override Image BackgroundImage
        { 
            get 
            {
                return base.BackgroundImage; 
            }
            set
            {
                base.BackgroundImage = value; 
            }
        } 
 
        /// 
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Never)
        ]
        public override ImageLayout BackgroundImageLayout 
        {
            get 
            { 
                return base.BackgroundImageLayout;
            } 
            set
            {
                base.BackgroundImageLayout = value;
            } 
        }
 
        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Never)
        ]
        new public event EventHandler BackgroundImageChanged
        { 
            add
            { 
                base.BackgroundImageChanged += value; 
            }
            remove 
            {
                base.BackgroundImageChanged -= value;
            }
        } 

        ///  
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Never) 
        ]
        new public event EventHandler BackgroundImageLayoutChanged
        {
            add 
            {
                base.BackgroundImageLayoutChanged += value; 
            } 
            remove
            { 
                base.BackgroundImageLayoutChanged -= value;
            }
        }
 
        /// 
        private bool ShouldSerializeBackgroundColor() 
        { 
            return !this.BackgroundColor.Equals(DefaultBackgroundBrush.Color);
        } 

        /// 
        [
            DefaultValue(BorderStyle.FixedSingle), 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_BorderStyleDescr) 
        ] 
        public BorderStyle BorderStyle
        { 
            get
            {
                return this.borderStyle;
            } 
            set
            { 
                // Sequential enum.  Valid values are 0x0 to 0x2 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)BorderStyle.None, (int)BorderStyle.Fixed3D)){
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(BorderStyle)); 
                }
                if (this.borderStyle != value)
                {
                    using (LayoutTransaction.CreateTransactionIf(this.AutoSize, this.ParentInternal, this, PropertyNames.BorderStyle)) 
                    {
                        this.borderStyle = value; 
                        if (!this.AutoSize) 
                        {
                            PerformLayoutPrivate(false /*useRowShortcut*/, false /*computeVisibleRows*/, true /*invalidInAdjustFillingColumns*/, true /*repositionEditingControl*/); 
                        }
                        Invalidate();
                        OnBorderStyleChanged(EventArgs.Empty);
                    } 
                }
            } 
        } 

        ///  
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewBorderStyleChangedDescr)
        ] 
        public event EventHandler BorderStyleChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWBORDERSTYLECHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWBORDERSTYLECHANGED, value); 
            }
        } 
 
        private int BorderWidth
        { 
            get
            {
                if (this.BorderStyle == BorderStyle.Fixed3D)
                { 
                    return Application.RenderWithVisualStyles ? 1 : SystemInformation.Border3DSize.Width;
                } 
                else if (this.BorderStyle == BorderStyle.FixedSingle) 
                {
                    return 1; 
                }
                else
                {
                    return 0; 
                }
            } 
        } 

        internal Graphics CachedGraphics 
        {
            get
            {
                if (this.cachedGraphics == null) 
                {
                    this.cachedGraphics = WindowsFormsUtils.CreateMeasurementGraphics(); 
                } 
                return this.cachedGraphics;
            } 
        }

        // Ime can be shown when there is a read-write current cell.
        protected override bool CanEnableIme 
        {
            get 
            { 
                bool canEnable = false;
 
                Debug.WriteLineIf( CompModSwitches.ImeMode.Level >= TraceLevel.Info, "Inside get_CanEnableIme(), this = " + this );
                Debug.Indent();

                if (this.ptCurrentCell.X != -1 /*&& !this.IsCurrentCellInEditMode*/ && ColumnEditable(this.ptCurrentCell.X)) 
                {
                    DataGridViewCell dataGridViewCell = this.CurrentCellInternal; 
                    Debug.Assert(dataGridViewCell != null); 

                    if (!IsSharedCellReadOnly(dataGridViewCell, this.ptCurrentCell.Y)) 
                    {
                        canEnable = base.CanEnableIme;
                    }
                } 

                Debug.WriteLineIf( CompModSwitches.ImeMode.Level >= TraceLevel.Info, "Value = " + canEnable ); 
                Debug.Unindent(); 

                return canEnable; 
            }
        }

        ///  
        [
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_CellBorderStyleDescr), 
            Browsable(true),
            DefaultValue(DataGridViewCellBorderStyle.Single) 
        ]
        public DataGridViewCellBorderStyle CellBorderStyle
        {
            get 
            {
                switch (this.advancedCellBorderStyle.All) 
                { 
                    case DataGridViewAdvancedCellBorderStyle.NotSet:
                        if (this.advancedCellBorderStyle.Top == DataGridViewAdvancedCellBorderStyle.None && 
                            this.advancedCellBorderStyle.Bottom == DataGridViewAdvancedCellBorderStyle.None)
                        {
                            if (this.RightToLeftInternal)
                            { 
                                if (this.advancedCellBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.None &&
                                    this.advancedCellBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.Single) 
                                { 
                                    return DataGridViewCellBorderStyle.SingleVertical;
                                } 
                            }
                            else
                            {
                                if (this.advancedCellBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.None && 
                                    this.advancedCellBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.Single)
                                { 
                                    return DataGridViewCellBorderStyle.SingleVertical; 
                                }
                            } 
                            if (this.advancedCellBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.Outset &&
                                this.advancedCellBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.Outset)
                            {
                                return DataGridViewCellBorderStyle.RaisedVertical; 
                            }
                            if (this.advancedCellBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.Inset && 
                                this.advancedCellBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.Inset) 
                            {
                                return DataGridViewCellBorderStyle.SunkenVertical; 
                            }
                        }
                        if (this.advancedCellBorderStyle.Left == DataGridViewAdvancedCellBorderStyle.None &&
                            this.advancedCellBorderStyle.Right == DataGridViewAdvancedCellBorderStyle.None) 
                        {
                            if (this.advancedCellBorderStyle.Top == DataGridViewAdvancedCellBorderStyle.None && 
                                this.advancedCellBorderStyle.Bottom == DataGridViewAdvancedCellBorderStyle.Single) 
                            {
                                return DataGridViewCellBorderStyle.SingleHorizontal; 
                            }
                            if (this.advancedCellBorderStyle.Top == DataGridViewAdvancedCellBorderStyle.Outset &&
                                this.advancedCellBorderStyle.Bottom == DataGridViewAdvancedCellBorderStyle.Outset)
                            { 
                                return DataGridViewCellBorderStyle.RaisedHorizontal;
                            } 
                            if (this.advancedCellBorderStyle.Top == DataGridViewAdvancedCellBorderStyle.Inset && 
                                this.advancedCellBorderStyle.Bottom == DataGridViewAdvancedCellBorderStyle.Inset)
                            { 
                                return DataGridViewCellBorderStyle.SunkenHorizontal;
                            }
                        }
                        return DataGridViewCellBorderStyle.Custom; 

                    case DataGridViewAdvancedCellBorderStyle.None: 
                        return DataGridViewCellBorderStyle.None; 

                    case DataGridViewAdvancedCellBorderStyle.Single: 
                        return DataGridViewCellBorderStyle.Single;

                    case DataGridViewAdvancedCellBorderStyle.Inset:
                        return DataGridViewCellBorderStyle.Sunken; 

                    case DataGridViewAdvancedCellBorderStyle.Outset: 
                        return DataGridViewCellBorderStyle.Raised; 

                    default: 
                        Debug.Fail("Unexpected this.advancedCellBorderStyle.All value in CellBorderStyle.get");
                        return DataGridViewCellBorderStyle.Custom;
                }
            } 
            set
            { 
                // Sequential enum.  Valid values are 0x0 to 0xa 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewCellBorderStyle.Custom, (int)DataGridViewCellBorderStyle.SunkenHorizontal))
                { 
                     throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewCellBorderStyle));
                }

                if (value != this.CellBorderStyle) 
                {
                    if (value == DataGridViewCellBorderStyle.Custom) 
                    { 
                        throw new ArgumentException(SR.GetString(SR.DataGridView_CustomCellBorderStyleInvalid, "CellBorderStyle"));
                    } 
                    this.dataGridViewOper[DATAGRIDVIEWOPER_inBorderStyleChange] = true;
                    try
                    {
                        switch (value) 
                        {
                            case DataGridViewCellBorderStyle.Single: 
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.Single; 
                                break;
 
                            case DataGridViewCellBorderStyle.Raised:
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.Outset;
                                break;
 
                            case DataGridViewCellBorderStyle.Sunken:
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.Inset; 
                                break; 

                            case DataGridViewCellBorderStyle.None: 
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                break;

                            case DataGridViewCellBorderStyle.SingleVertical: 
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                if (this.RightToLeftInternal) 
                                { 
                                    this.advancedCellBorderStyle.LeftInternal = DataGridViewAdvancedCellBorderStyle.Single;
                                } 
                                else
                                {
                                    this.advancedCellBorderStyle.RightInternal = DataGridViewAdvancedCellBorderStyle.Single;
                                } 
                                break;
 
                            case DataGridViewCellBorderStyle.RaisedVertical: 
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                this.advancedCellBorderStyle.RightInternal = DataGridViewAdvancedCellBorderStyle.Outset; 
                                this.advancedCellBorderStyle.LeftInternal = DataGridViewAdvancedCellBorderStyle.Outset;
                                break;

                            case DataGridViewCellBorderStyle.SunkenVertical: 
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                this.advancedCellBorderStyle.RightInternal = DataGridViewAdvancedCellBorderStyle.Inset; 
                                this.advancedCellBorderStyle.LeftInternal = DataGridViewAdvancedCellBorderStyle.Inset; 
                                break;
 
                            case DataGridViewCellBorderStyle.SingleHorizontal:
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                this.advancedCellBorderStyle.BottomInternal = DataGridViewAdvancedCellBorderStyle.Single;
                                break; 

                            case DataGridViewCellBorderStyle.RaisedHorizontal: 
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None; 
                                this.advancedCellBorderStyle.TopInternal = DataGridViewAdvancedCellBorderStyle.Outset;
                                this.advancedCellBorderStyle.BottomInternal = DataGridViewAdvancedCellBorderStyle.Outset; 
                                break;

                            case DataGridViewCellBorderStyle.SunkenHorizontal:
                                this.advancedCellBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None; 
                                this.advancedCellBorderStyle.TopInternal = DataGridViewAdvancedCellBorderStyle.Inset;
                                this.advancedCellBorderStyle.BottomInternal = DataGridViewAdvancedCellBorderStyle.Inset; 
                                break; 
                        }
                    } 
                    finally
                    {
                        this.dataGridViewOper[DATAGRIDVIEWOPER_inBorderStyleChange] = false;
                    } 
                    OnCellBorderStyleChanged(EventArgs.Empty);
                } 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_CellBorderStyleChangedDescr) 
        ]
        public event EventHandler CellBorderStyleChanged 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLBORDERSTYLECHANGED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLBORDERSTYLECHANGED, value);
            } 
        } 

        internal bool CellMouseDownInContentBounds 
        {
            get
            {
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_cellMouseDownInContentBounds]; 
            }
            set 
            { 
                this.dataGridViewState2[DATAGRIDVIEWSTATE2_cellMouseDownInContentBounds] = value;
            } 
        }

        internal DataGridViewCellPaintingEventArgs CellPaintingEventArgs
        { 
            get
            { 
                if (this.dgvcpe == null) 
                {
                    this.dgvcpe = new DataGridViewCellPaintingEventArgs(this); 
                }
                return this.dgvcpe;
            }
        } 

        private DataGridViewCellStyleChangedEventArgs CellStyleChangedEventArgs 
        { 
            get
            { 
                if (this.dgvcsce == null)
                {
                    this.dgvcsce = new DataGridViewCellStyleChangedEventArgs();
                } 
                return this.dgvcsce;
            } 
        } 

        internal DataGridViewCellValueEventArgs CellValueEventArgs 
        {
            get
            {
                if (this.dgvcve == null) 
                {
                    this.dgvcve = new DataGridViewCellValueEventArgs(); 
                } 
                return this.dgvcve;
            } 
        }

        /// 
        [ 
            Browsable(true),
            DefaultValue(DataGridViewClipboardCopyMode.EnableWithAutoHeaderText), 
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_ClipboardCopyModeDescr)
        ] 
        public DataGridViewClipboardCopyMode ClipboardCopyMode
        {
            get
            { 
                return this.clipboardCopyMode;
            } 
            set 
            {
                // Sequential enum.  Valid values are 0x0 to 0x3 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewClipboardCopyMode.Disable, (int)DataGridViewClipboardCopyMode.EnableAlwaysIncludeHeaderText))
                {
                   throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewClipboardCopyMode));
                } 
                this.clipboardCopyMode = value;
            } 
        } 

        ///  
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
            DefaultValue(0), 
            EditorBrowsable(EditorBrowsableState.Advanced)
        ] 
        public int ColumnCount 
        {
            get 
            {
                return this.Columns.Count;
            }
            set 
            {
                if (value < 0) 
                { 
                    throw new ArgumentOutOfRangeException("ColumnCount", SR.GetString(SR.InvalidLowBoundArgumentEx, "ColumnCount", value.ToString(CultureInfo.CurrentCulture), (0).ToString(CultureInfo.CurrentCulture)));
                } 
                if (this.DataSource != null)
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_CannotSetColumnCountOnDataBoundDataGridView));
                } 
                if (value != this.Columns.Count)
                { 
                    if (value == 0) 
                    {
                        // Total removal of the columns. This also clears the rows. 
                        this.Columns.Clear();
                    }
                    else if (value < this.Columns.Count)
                    { 
                        // Some columns need to be removed, from the tail of the columns collection
                        while (value < this.Columns.Count) 
                        { 
                            int currentColumnCount = this.Columns.Count;
                            this.Columns.RemoveAt(currentColumnCount - 1); 
                            if (this.Columns.Count >= currentColumnCount)
                            {
                                // Column removal failed. We stop the loop.
                                break; 
                            }
                        } 
                    } 
                    else
                    { 
                        // Some DataGridViewTextBoxColumn columns need to be appened.
                        while (value > this.Columns.Count)
                        {
                            int currentColumnCount = this.Columns.Count; 
                            this.Columns.Add(null /*columnName*/, null /*headerText*/);
                            if (this.Columns.Count <= currentColumnCount) 
                            { 
                                // Column addition failed. We stop the loop.
                                break; 
                            }
                        }
                    }
                } 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_ColumnHeadersBorderStyleDescr),
            Browsable(true),
            DefaultValue(DataGridViewHeaderBorderStyle.Raised) 
        ]
        public DataGridViewHeaderBorderStyle ColumnHeadersBorderStyle 
        { 
            get
            { 
                switch (this.advancedColumnHeadersBorderStyle.All)
                {
                    case DataGridViewAdvancedCellBorderStyle.NotSet:
                        return DataGridViewHeaderBorderStyle.Custom; 

                    case DataGridViewAdvancedCellBorderStyle.None: 
                        return DataGridViewHeaderBorderStyle.None; 

                    case DataGridViewAdvancedCellBorderStyle.Single: 
                        return DataGridViewHeaderBorderStyle.Single;

                    case DataGridViewAdvancedCellBorderStyle.InsetDouble:
                        return DataGridViewHeaderBorderStyle.Sunken; 

                    case DataGridViewAdvancedCellBorderStyle.OutsetPartial: 
                        return DataGridViewHeaderBorderStyle.Raised; 

                    default: 
                        return DataGridViewHeaderBorderStyle.Custom;
                }
            }
            set 
            {
                // Sequential enum.  Valid values are 0x0 to 0x4 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewHeaderBorderStyle.Custom, (int)DataGridViewHeaderBorderStyle.None)) 
                {
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewHeaderBorderStyle)); 
                }
                if (value != this.ColumnHeadersBorderStyle)
                {
                    if (value == DataGridViewHeaderBorderStyle.Custom) 
                    {
                        throw new ArgumentException(SR.GetString(SR.DataGridView_CustomCellBorderStyleInvalid, "ColumnHeadersBorderStyle")); 
                    } 
                    this.dataGridViewOper[DATAGRIDVIEWOPER_inBorderStyleChange] = true;
                    try 
                    {
                        switch (value)
                        {
                            case DataGridViewHeaderBorderStyle.Single: 
                                this.advancedColumnHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.Single;
                                break; 
 
                            case DataGridViewHeaderBorderStyle.Raised:
                                this.advancedColumnHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.OutsetPartial; 
                                break;

                            case DataGridViewHeaderBorderStyle.Sunken:
                                this.advancedColumnHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.InsetDouble; 
                                break;
 
                            case DataGridViewHeaderBorderStyle.None: 
                                this.advancedColumnHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                break; 
                        }
                    }
                    finally
                    { 
                        this.dataGridViewOper[DATAGRIDVIEWOPER_inBorderStyleChange] = false;
                    } 
                    OnColumnHeadersBorderStyleChanged(EventArgs.Empty); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnHeadersBorderStyleChangedDescr) 
        ] 
        public event EventHandler ColumnHeadersBorderStyleChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSBORDERSTYLECHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSBORDERSTYLECHANGED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_ColumnHeadersDefaultCellStyleDescr),
            AmbientValue(null) 
        ] 
        public DataGridViewCellStyle ColumnHeadersDefaultCellStyle
        { 
            get
            {
                if (this.columnHeadersDefaultCellStyle == null)
                { 
                    this.columnHeadersDefaultCellStyle = this.DefaultColumnHeadersDefaultCellStyle;
                } 
                return this.columnHeadersDefaultCellStyle; 
            }
            set 
            {
                DataGridViewCellStyle cs = this.ColumnHeadersDefaultCellStyle;
                cs.RemoveScope(DataGridViewCellStyleScopes.ColumnHeaders);
                this.columnHeadersDefaultCellStyle = value; 
                if (value != null)
                { 
                    this.columnHeadersDefaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.ColumnHeaders); 
                }
                DataGridViewCellStyleDifferences dgvcsc = cs.GetDifferencesFrom(this.ColumnHeadersDefaultCellStyle); 
                if (dgvcsc != DataGridViewCellStyleDifferences.None)
                {
                    this.CellStyleChangedEventArgs.ChangeAffectsPreferredSize = (dgvcsc == DataGridViewCellStyleDifferences.AffectPreferredSize);
                    OnColumnHeadersDefaultCellStyleChanged(this.CellStyleChangedEventArgs); 
                }
            } 
        } 

        private DataGridViewCellStyle DefaultColumnHeadersDefaultCellStyle { 
            get
            {
                DataGridViewCellStyle defaultStyle = new DataGridViewCellStyle();
                defaultStyle.BackColor = DefaultHeadersBackBrush.Color; 
                defaultStyle.ForeColor = DefaultForeBrush.Color;
                defaultStyle.SelectionBackColor = DefaultSelectionBackBrush.Color; 
                defaultStyle.SelectionForeColor = DefaultSelectionForeBrush.Color; 
                defaultStyle.Font = base.Font;
                defaultStyle.AlignmentInternal = DataGridViewContentAlignment.MiddleLeft; 
                defaultStyle.WrapModeInternal = DataGridViewTriState.True;
                defaultStyle.AddScope(this, DataGridViewCellStyleScopes.ColumnHeaders);

                this.dataGridViewState1[DATAGRIDVIEWSTATE1_ambientColumnHeadersFont] = true; 

                return defaultStyle; 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewColumnHeadersDefaultCellStyleChangedDescr) 
        ]
        public event EventHandler ColumnHeadersDefaultCellStyleChanged 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSDEFAULTCELLSTYLECHANGED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSDEFAULTCELLSTYLECHANGED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatAppearance),
            Localizable(true),
            SRDescription(SR.DataGridView_ColumnHeadersHeightDescr) 
        ]
        public int ColumnHeadersHeight 
        { 
            get
            { 
                return this.columnHeadersHeight;
            }
            set
            { 
                if (value < minimumColumnHeadersHeight)
                { 
                    throw new ArgumentOutOfRangeException("ColumnHeadersHeight", SR.GetString(SR.InvalidLowBoundArgumentEx, "ColumnHeadersHeight", (value).ToString(CultureInfo.CurrentCulture), (minimumColumnHeadersHeight).ToString(CultureInfo.CurrentCulture))); 
                }
                if (value > maxHeadersThickness) 
                {
                    throw new ArgumentOutOfRangeException("ColumnHeadersHeight", SR.GetString(SR.InvalidHighBoundArgumentEx, "ColumnHeadersHeight", (value).ToString(CultureInfo.CurrentCulture), (maxHeadersThickness).ToString(CultureInfo.CurrentCulture)));
                }
                if (this.ColumnHeadersHeightSizeMode == DataGridViewColumnHeadersHeightSizeMode.AutoSize) 
                {
                    this.cachedColumnHeadersHeight = value; 
                } 
                else if (this.columnHeadersHeight != value)
                { 
                    SetColumnHeadersHeightInternal(value, true /*invalidInAdjustFillingColumns*/);
                }
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewColumnHeadersHeightChangedDescr) 
        ]
        public event EventHandler ColumnHeadersHeightChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSHEIGHTCHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSHEIGHTCHANGED, value);
            }
        }
 
        private bool ShouldSerializeColumnHeadersHeight()
        { 
            return this.ColumnHeadersHeightSizeMode != DataGridViewColumnHeadersHeightSizeMode.AutoSize && defaultColumnHeadersHeight != this.ColumnHeadersHeight; 
        }
 
        /// 
        /// 
        ///    
        ///       Gets or sets a value that determines the behavior for adjusting the column headers height. 
        ///    
        ///  
        [ 
            DefaultValue(DataGridViewColumnHeadersHeightSizeMode.EnableResizing),
            RefreshProperties(RefreshProperties.All), 
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_ColumnHeadersHeightSizeModeDescr)
        ]
        public DataGridViewColumnHeadersHeightSizeMode ColumnHeadersHeightSizeMode 
        {
            get 
            { 
                return this.columnHeadersHeightSizeMode;
            } 
            set
            {
               // Sequential enum.  Valid values are 0x0 to 0x2
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewColumnHeadersHeightSizeMode.EnableResizing, (int)DataGridViewColumnHeadersHeightSizeMode.AutoSize)) 
                {
                     throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewColumnHeadersHeightSizeMode)); 
                } 
                if (this.columnHeadersHeightSizeMode != value)
                { 
                    /*if (value == DataGridViewColumnHeadersHeightSizeMode.AutoSize && !this.ColumnHeadersVisible)
                    {
                        We intentionally don't throw an error because of designer code spit order.
                    }*/ 
                    DataGridViewAutoSizeModeEventArgs dgvasme = new DataGridViewAutoSizeModeEventArgs(this.columnHeadersHeightSizeMode == DataGridViewColumnHeadersHeightSizeMode.AutoSize);
                    this.columnHeadersHeightSizeMode = value; 
                    OnColumnHeadersHeightSizeModeChanged(dgvasme); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnHeadersHeightSizeModeChangedDescr) 
        ] 
        public event DataGridViewAutoSizeModeEventHandler ColumnHeadersHeightSizeModeChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSHEIGHTSIZEMODECHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERSHEIGHTSIZEMODECHANGED, value); 
            }
        } 

        /// 
        /// 
        ///     
        ///       Gets
        ///       or sets a value indicating if the dataGridView's column headers are visible. 
        ///     
        /// 
        [ 
            SRCategory(SR.CatAppearance),
            DefaultValue(true),
            SRDescription(SR.DataGridViewColumnHeadersVisibleDescr)
        ] 
        public bool ColumnHeadersVisible
        { 
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_columnHeadersVisible]; 
            }
            set
            {
                if (this.ColumnHeadersVisible != value) 
                {
                    if (!value) 
                    { 
                        // Make sure that there is no visible column that only counts on the column headers to autosize
                        DataGridViewColumn dataGridViewColumn = this.Columns.GetFirstColumn(DataGridViewElementStates.Visible); 
                        while (dataGridViewColumn != null)
                        {
                            if (dataGridViewColumn.InheritedAutoSizeMode == DataGridViewAutoSizeColumnMode.ColumnHeader)
                            { 
                                throw new InvalidOperationException(SR.GetString(SR.DataGridView_ColumnHeadersCannotBeInvisible));
                            } 
                            dataGridViewColumn = this.Columns.GetNextColumn(dataGridViewColumn, 
                                DataGridViewElementStates.Visible,
                                DataGridViewElementStates.None); 
                        }
                    }
                    using (LayoutTransaction.CreateTransactionIf(this.AutoSize, this.ParentInternal, this, PropertyNames.ColumnHeadersVisible))
                    { 
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_columnHeadersVisible] = value;
                        this.layout.ColumnHeadersVisible = value; 
                        this.displayedBandsInfo.EnsureDirtyState(); 
                        if (!this.AutoSize)
                        { 
                            PerformLayoutPrivate(false /*useRowShortcut*/, false /*computeVisibleRows*/, true /*invalidInAdjustFillingColumns*/, true /*repositionEditingControl*/);
                        }
                        InvalidateInside();
                        OnColumnHeadersGlobalAutoSize(); 
                    }
                } 
            } 
        }
 
        /// 
        [
            Editor("System.Windows.Forms.Design.DataGridViewColumnCollectionEditor, " + AssemblyRef.SystemDesign, typeof(System.Drawing.Design.UITypeEditor)),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Content), 
            MergableProperty(false)
        ] 
        public DataGridViewColumnCollection Columns 
        {
            get 
            {
                if (this.dataGridViewColumns == null)
                {
                    this.dataGridViewColumns = CreateColumnsInstance(); 
                }
                return this.dataGridViewColumns; 
            } 
        }
 
        /// 
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public DataGridViewCell CurrentCell 
        { 
            get
            { 
                if (this.ptCurrentCell.X == -1 && this.ptCurrentCell.Y == -1)
                {
                    return null;
                } 
                Debug.Assert(this.ptCurrentCell.X >= 0 && ptCurrentCell.Y >= 0);
                Debug.Assert(this.ptCurrentCell.X < this.Columns.Count); 
                Debug.Assert(this.ptCurrentCell.Y < this.Rows.Count); 
                DataGridViewRow dataGridViewRow = (DataGridViewRow) this.Rows[this.ptCurrentCell.Y]; // unsharing row
                return dataGridViewRow.Cells[this.ptCurrentCell.X]; 
            }
            set
            {
                if ((value != null && (value.RowIndex != this.ptCurrentCell.Y || value.ColumnIndex != this.ptCurrentCell.X)) || 
                    (value == null && this.ptCurrentCell.X != -1))
                { 
                    if (value == null) 
                    {
                        ClearSelection(); 
                        if (!SetCurrentCellAddressCore(-1, -1, true /*setAnchorCellAddress*/, true /*validateCurrentCell*/, false /*throughMouseClick*/))
                        {
                            // Edited value couldn't be committed or aborted
                            throw new InvalidOperationException(SR.GetString(SR.DataGridView_CellChangeCannotBeCommittedOrAborted)); 
                        }
                    } 
                    else 
                    {
                        if (value.DataGridView != this) 
                        {
                            throw new ArgumentException(SR.GetString(SR.DataGridView_CellDoesNotBelongToDataGridView));
                        }
                        if (!this.Columns[value.ColumnIndex].Visible || 
                            (this.Rows.GetRowState(value.RowIndex) & DataGridViewElementStates.Visible) == 0)
                        { 
                            throw new InvalidOperationException(SR.GetString(SR.DataGridView_CurrentCellCannotBeInvisible)); 
                        }
                        if (!ScrollIntoView(value.ColumnIndex, value.RowIndex, true)) 
                        {
                            throw new InvalidOperationException(SR.GetString(SR.DataGridView_CellChangeCannotBeCommittedOrAborted));
                        }
                        if (IsInnerCellOutOfBounds(value.ColumnIndex, value.RowIndex)) 
                        {
                            return; 
                        } 
                        ClearSelection(value.ColumnIndex, value.RowIndex, true /*selectExceptionElement*/);
                        if (!SetCurrentCellAddressCore(value.ColumnIndex, value.RowIndex, true, false, false)) 
                        {
                            throw new InvalidOperationException(SR.GetString(SR.DataGridView_CellChangeCannotBeCommittedOrAborted));
                        }
                    } 
                }
            } 
        } 

        ///  
        [
            Browsable(false)
        ]
        public Point CurrentCellAddress 
        {
            get 
            { 
                return this.ptCurrentCell;
            } 
        }

        private DataGridViewCell CurrentCellInternal
        { 
            get
            { 
                Debug.Assert(this.ptCurrentCell.X >= 0 && this.ptCurrentCell.X < this.Columns.Count); 
                Debug.Assert(this.ptCurrentCell.Y >= 0 && this.ptCurrentCell.Y < this.Rows.Count);
                DataGridViewRow dataGridViewRow = this.Rows.SharedRow(this.ptCurrentCell.Y); 
                Debug.Assert(dataGridViewRow != null);
                DataGridViewCell dataGridViewCell = dataGridViewRow.Cells[this.ptCurrentCell.X];
                Debug.Assert(this.IsSharedCellVisible(dataGridViewCell, this.ptCurrentCell.Y));
                return dataGridViewCell; 
            }
        } 
 
        private bool CurrentCellIsFirstVisibleCell
        { 
            get
            {
                if (this.ptCurrentCell.X == -1)
                { 
                    return false;
                } 
                Debug.Assert(this.ptCurrentCell.Y != -1); 

                bool previousVisibleColumnExists = (null != this.Columns.GetPreviousColumn(this.Columns[this.ptCurrentCell.X], DataGridViewElementStates.Visible, DataGridViewElementStates.None)); 
                bool previousVisibleRowExists = (-1 != this.Rows.GetPreviousRow(this.ptCurrentCell.Y, DataGridViewElementStates.Visible));

                return !previousVisibleColumnExists && !previousVisibleRowExists;
            } 
        }
 
        private bool CurrentCellIsLastVisibleCell 
        {
            get 
            {
                if (this.ptCurrentCell.X == -1)
                {
                    return false; 
                }
 
                Debug.Assert(this.ptCurrentCell.Y != -1); 

                bool nextVisibleColumnExists = (null != this.Columns.GetNextColumn(this.Columns[this.ptCurrentCell.X], DataGridViewElementStates.Visible, DataGridViewElementStates.None)); 
                bool nextVisibleRowExists = (-1 != this.Rows.GetNextRow(this.ptCurrentCell.Y, DataGridViewElementStates.Visible));

                return !nextVisibleColumnExists && !nextVisibleRowExists;
            } 
        }
 
        private bool CurrentCellIsEditedAndOnlySelectedCell 
        {
            get 
            {
                if (this.ptCurrentCell.X == -1)
                {
                    return false; 
                }
 
                Debug.Assert(this.ptCurrentCell.Y != -1); 

                return this.editingControl != null && 
                       GetCellCount(DataGridViewElementStates.Selected) == 1 &&
                       this.CurrentCellInternal.Selected;
            }
        } 

        ///  
        [ 
            Browsable(false)
        ] 
        public DataGridViewRow CurrentRow
        {
            get
            { 
                if (this.ptCurrentCell.X == -1)
                { 
                    return null; 
                }
 
                Debug.Assert(this.ptCurrentCell.Y >= 0);
                Debug.Assert(this.ptCurrentCell.Y < this.Rows.Count);

                return this.Rows[this.ptCurrentCell.Y]; 
            }
        } 
 
        internal Cursor CursorInternal
        { 
            set
            {
                this.dataGridViewState2[DATAGRIDVIEWSTATE2_ignoreCursorChange] = true;
                try 
                {
                    this.Cursor = value; 
                } 
                finally
                { 
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_ignoreCursorChange] = false;
                }
            }
        } 

        internal DataGridViewDataConnection DataConnection 
        { 
            get
            { 
                return this.dataConnection;
            }
        }
 
        /// 
        [ 
         DefaultValue(""), 
         SRCategory(SR.CatData),
         Editor("System.Windows.Forms.Design.DataMemberListEditor, " + AssemblyRef.SystemDesign, typeof(System.Drawing.Design.UITypeEditor)), 
         SRDescription(SR.DataGridViewDataMemberDescr)
        ]
        public string DataMember
        { 
            get
            { 
                if (this.dataConnection == null) 
                {
                    return String.Empty; 
                }
                else
                {
                    return this.dataConnection.DataMember; 
                }
            } 
            set 
            {
                if (value != this.DataMember) 
                {
                    this.CurrentCell = null;
                    if (this.dataConnection == null)
                    { 
                        this.dataConnection = new DataGridViewDataConnection(this);
                    } 
                    this.dataConnection.SetDataConnection(this.DataSource, value); 
                    OnDataMemberChanged(EventArgs.Empty);
                } 
            }
        }

        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridViewDataMemberChangedDescr) 
        ]
        public event EventHandler DataMemberChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWDATAMEMBERCHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWDATAMEMBERCHANGED, value);
            } 
        }

        /// 
        [ 
         DefaultValue(null),
         SRCategory(SR.CatData), 
         RefreshProperties(RefreshProperties.Repaint), 
         AttributeProvider(typeof(IListSource)),
         SRDescription(SR.DataGridViewDataSourceDescr) 
        ]
        public object DataSource
        {
            get 
            {
                if (this.dataConnection == null) 
                { 
                    return null;
                } 
                else
                {
                    return this.dataConnection.DataSource;
                } 
            }
            set 
            { 
                if (value != this.DataSource)
                { 
                    this.CurrentCell = null;
                    if (this.dataConnection == null)
                    {
                        this.dataConnection = new DataGridViewDataConnection(this); 
                        this.dataConnection.SetDataConnection(value, this.DataMember);
                    } 
                    else 
                    {
                        if (this.dataConnection.ShouldChangeDataMember(value)) 
                        {
                            // we fire DataMemberChanged event
                            this.DataMember = "";
                        } 
                        this.dataConnection.SetDataConnection(value, this.DataMember);
                        if (value == null) 
                        { 
                            this.dataConnection = null;
                        } 
                    }
                    OnDataSourceChanged(EventArgs.Empty);
                }
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridViewDataSourceChangedDescr)
        ]
        public event EventHandler DataSourceChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWDATASOURCECHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWDATASOURCECHANGED, value);
            }
        } 

        private static SolidBrush DefaultBackBrush 
        { 
            get
            { 
                return (SolidBrush) SystemBrushes.Window;
            }
        }
 
        private static SolidBrush DefaultBackgroundBrush
        { 
            get 
            {
                return (SolidBrush) SystemBrushes.AppWorkspace; 
            }
        }

        ///  
        [
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_DefaultCellStyleDescr), 
            AmbientValue(null)
        ] 
        public DataGridViewCellStyle DefaultCellStyle
        {
            get
            { 
                if (this.defaultCellStyle == null)
                { 
                    this.defaultCellStyle = this.DefaultDefaultCellStyle; 
                    return this.defaultCellStyle;
                } 
                else if (this.defaultCellStyle.BackColor == Color.Empty ||
                    this.defaultCellStyle.ForeColor == Color.Empty ||
                    this.defaultCellStyle.SelectionBackColor == Color.Empty ||
                    this.defaultCellStyle.SelectionForeColor == Color.Empty || 
                    this.defaultCellStyle.Font == null ||
                    this.defaultCellStyle.Alignment == DataGridViewContentAlignment.NotSet || 
                    this.defaultCellStyle.WrapMode == DataGridViewTriState.NotSet) 
                {
                    DataGridViewCellStyle defaultCellStyleTmp = new DataGridViewCellStyle(this.defaultCellStyle); 
                    defaultCellStyleTmp.Scope = DataGridViewCellStyleScopes.None;
                    if (this.defaultCellStyle.BackColor == Color.Empty)
                    {
                        defaultCellStyleTmp.BackColor = DefaultBackBrush.Color; 
                    }
                    if (this.defaultCellStyle.ForeColor == Color.Empty) 
                    { 
                        defaultCellStyleTmp.ForeColor = base.ForeColor;
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_ambientForeColor] = true; 
                    }
                    if (this.defaultCellStyle.SelectionBackColor == Color.Empty)
                    {
                        defaultCellStyleTmp.SelectionBackColor = DefaultSelectionBackBrush.Color; 
                    }
                    if (this.defaultCellStyle.SelectionForeColor == Color.Empty) 
                    { 
                        defaultCellStyleTmp.SelectionForeColor = DefaultSelectionForeBrush.Color;
                    } 
                    if (this.defaultCellStyle.Font == null)
                    {
                        defaultCellStyleTmp.Font = base.Font;
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_ambientFont] = true; 
                    }
                    if (this.defaultCellStyle.Alignment == DataGridViewContentAlignment.NotSet) 
                    { 
                        defaultCellStyleTmp.AlignmentInternal = DataGridViewContentAlignment.MiddleLeft;
                    } 
                    if (this.defaultCellStyle.WrapMode == DataGridViewTriState.NotSet)
                    {
                        defaultCellStyleTmp.WrapModeInternal = DataGridViewTriState.False;
                    } 
                    defaultCellStyleTmp.AddScope(this, DataGridViewCellStyleScopes.DataGridView);
                    return defaultCellStyleTmp; 
                } 
                else
                { 
                    return this.defaultCellStyle;
                }
            }
            set 
            {
                DataGridViewCellStyle cs = this.DefaultCellStyle; 
                cs.RemoveScope(DataGridViewCellStyleScopes.DataGridView); 
                this.defaultCellStyle = value;
                if (value != null) 
                {
                    this.defaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.DataGridView);
                }
                DataGridViewCellStyleDifferences dgvcsc = cs.GetDifferencesFrom(this.DefaultCellStyle); 
                if (dgvcsc != DataGridViewCellStyleDifferences.None)
                { 
                    this.CellStyleChangedEventArgs.ChangeAffectsPreferredSize = (dgvcsc == DataGridViewCellStyleDifferences.AffectPreferredSize); 
                    OnDefaultCellStyleChanged(this.CellStyleChangedEventArgs);
                } 
            }
        }

        private DataGridViewCellStyle DefaultDefaultCellStyle 
        {
            get 
            { 
                DataGridViewCellStyle defaultCellStyle = new DataGridViewCellStyle();
                defaultCellStyle.BackColor = DefaultBackBrush.Color; 
                defaultCellStyle.ForeColor = base.ForeColor;
                defaultCellStyle.SelectionBackColor = DefaultSelectionBackBrush.Color;
                defaultCellStyle.SelectionForeColor = DefaultSelectionForeBrush.Color;
                defaultCellStyle.Font = base.Font; 
                defaultCellStyle.AlignmentInternal = DataGridViewContentAlignment.MiddleLeft;
                defaultCellStyle.WrapModeInternal = DataGridViewTriState.False; 
                defaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.DataGridView); 

                this.dataGridViewState1[DATAGRIDVIEWSTATE1_ambientFont] = true; 
                this.dataGridViewState1[DATAGRIDVIEWSTATE1_ambientForeColor] = true;

                return defaultCellStyle;
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridViewDefaultCellStyleChangedDescr)
        ]
        public event EventHandler DefaultCellStyleChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWDEFAULTCELLSTYLECHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWDEFAULTCELLSTYLECHANGED, value);
            }
        } 

        private static SolidBrush DefaultForeBrush 
        { 
            get
            { 
                return (SolidBrush) SystemBrushes.WindowText;
            }
        }
 
        private static Color DefaultGridColor
        { 
            get 
            {
                return SystemColors.ControlDark; 
            }
        }

        private static SolidBrush DefaultHeadersBackBrush 
        {
            get 
            { 
                return (SolidBrush) SystemBrushes.Control;
            } 
        }

        private DataGridViewCellStyle DefaultRowHeadersDefaultCellStyle
        { 
            get
            { 
                DataGridViewCellStyle defaultStyle = new DataGridViewCellStyle(); 
                defaultStyle.BackColor = DefaultHeadersBackBrush.Color;
                defaultStyle.ForeColor = DefaultForeBrush.Color; 
                defaultStyle.SelectionBackColor = DefaultSelectionBackBrush.Color;
                defaultStyle.SelectionForeColor = DefaultSelectionForeBrush.Color;
                defaultStyle.Font = base.Font;
                defaultStyle.AlignmentInternal = DataGridViewContentAlignment.MiddleLeft; 
                defaultStyle.WrapModeInternal = DataGridViewTriState.True;
                defaultStyle.AddScope(this, DataGridViewCellStyleScopes.RowHeaders); 
 
                this.dataGridViewState1[DATAGRIDVIEWSTATE1_ambientRowHeadersFont] = true;
 
                return defaultStyle;
            }
        }
 
        private static SolidBrush DefaultSelectionBackBrush
        { 
            get 
            {
                return (SolidBrush) SystemBrushes.Highlight; 
            }
        }

        private static SolidBrush DefaultSelectionForeBrush 
        {
            get 
            { 
                return (SolidBrush) SystemBrushes.HighlightText;
            } 
        }

        /// 
        protected override Size DefaultSize 
        {
            get 
            { 
                return new Size(240, 150);
            } 
        }

        internal DisplayedBandsData DisplayedBandsInfo
        { 
            get
            { 
                return this.displayedBandsInfo; 
            }
        } 

        /// 
        /// 
        ///     Returns the client rect of the display area of the control. 
        ///     The DataGridView control return its client rectangle minus the potential scrollbars.
        ///  
        public override Rectangle DisplayRectangle { 
            get {
                Rectangle rectDisplay = this.ClientRectangle; 
                if (this.horizScrollBar != null && this.horizScrollBar.Visible)
                {
                    rectDisplay.Height -= this.horizScrollBar.Height;
                } 
                if (this.vertScrollBar != null && this.vertScrollBar.Visible)
                { 
                    rectDisplay.Width -= this.vertScrollBar.Width; 
                    if (this.RightToLeftInternal)
                    { 
                        rectDisplay.X = this.vertScrollBar.Width;
                    }
                }
                return rectDisplay; 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatBehavior),
            DefaultValue(DataGridViewEditMode.EditOnKeystrokeOrF2),
            SRDescription(SR.DataGridView_EditModeDescr)
        ] 
        public DataGridViewEditMode EditMode
        { 
            get 
            {
                return this.editMode; 
            }
            set
            {
                // Sequential enum.  Valid values are 0x0 to 0x4 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewEditMode.EditOnEnter, (int)DataGridViewEditMode.EditProgrammatically))
                { 
                     throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewEditMode)); 
                }
                if (this.editMode != value) 
                {
                    this.editMode = value;
                    OnEditModeChanged(EventArgs.Empty);
                } 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_EditModeChangedDescr)
        ]
        public event EventHandler EditModeChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWEDITMODECHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWEDITMODECHANGED, value);
            } 
        }
 
        internal Point MouseEnteredCellAddress 
        {
            get 
            {
                return this.ptMouseEnteredCell;
            }
        } 

        private bool MouseOverEditingControl 
        { 
            get
            { 
                if (this.editingControl != null)
                {
                    Point ptMouse = PointToClient(Control.MousePosition);
                    return this.editingControl.Bounds.Contains(ptMouse); 
                }
                return false; 
            } 
        }
 
        private bool MouseOverEditingPanel
        {
            get
            { 
                if (this.editingPanel != null)
                { 
                    Point ptMouse = PointToClient(Control.MousePosition); 
                    return this.editingPanel.Bounds.Contains(ptMouse);
                } 
                return false;
            }
        }
 
        private bool MouseOverScrollBar
        { 
            get 
            {
                Point ptMouse = PointToClient(Control.MousePosition); 
                if (this.vertScrollBar != null && this.vertScrollBar.Visible)
                {
                    if (this.vertScrollBar.Bounds.Contains(ptMouse))
                    { 
                        return true;
                    } 
                } 
                if (this.horizScrollBar != null && this.horizScrollBar.Visible)
                { 
                    return this.horizScrollBar.Bounds.Contains(ptMouse);
                }
                return false;
            } 
        }
 
        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced)
        ]
        public Control EditingControl
        { 
            get
            { 
                return this.editingControl; 
            }
        } 

        /// 
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced)
        ] 
        public Panel EditingPanel 
        {
            get 
            {
                if (this.editingPanel == null)
                {
                    this.editingPanel = new Panel(); 
                    this.editingPanel.AccessibleName = SR.GetString(SR.DataGridView_AccEditingPanelAccName);
                } 
                return this.editingPanel; 
            }
        } 

        /// 
        /// 
        ///     
        ///     Determines whether the DataGridView's header cells render using XP theming visual styles or not
        ///     when visual styles are enabled in the application. 
        ///     
        /// 
        [ 
            SRCategory(SR.CatAppearance),
            DefaultValue(true),
            SRDescription(SR.DataGridView_EnableHeadersVisualStylesDescr)
        ] 
        public bool EnableHeadersVisualStyles
        { 
            get 
            {
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_enableHeadersVisualStyles]; 
            }
            set
            {
                if (this.dataGridViewState2[DATAGRIDVIEWSTATE2_enableHeadersVisualStyles] != value) 
                {
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_enableHeadersVisualStyles] = value; 
                    //OnEnableHeadersVisualStylesChanged(EventArgs.Empty); 
                    // Some autosizing may have to be applied since the margins are potentially changed.
                    OnGlobalAutoSize(); // Put this into OnEnableHeadersVisualStylesChanged if created. 
                }
            }
        }
 
        /// 
        [ 
            Browsable(false), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public DataGridViewCell FirstDisplayedCell
        {
            get
            { 
                Point firstDisplayedCellAddress = this.FirstDisplayedCellAddress;
                if (firstDisplayedCellAddress.X >= 0) 
                { 
                    return this.Rows[firstDisplayedCellAddress.Y].Cells[firstDisplayedCellAddress.X]; // unshares the row of first displayed cell
                } 
                return null;
            }
            set
            { 
                if (value != null)
                { 
                    DataGridViewCell firstDisplayedCell = value; 
                    if (firstDisplayedCell.DataGridView != this)
                    { 
                        throw new ArgumentException(SR.GetString(SR.DataGridView_CellDoesNotBelongToDataGridView));
                    }
                    if (firstDisplayedCell.RowIndex == -1 || firstDisplayedCell.ColumnIndex == -1)
                    { 
                        throw new InvalidOperationException(SR.GetString(SR.DataGridView_FirstDisplayedCellCannotBeAHeaderOrSharedCell));
                    } 
 
                    Debug.Assert(firstDisplayedCell.RowIndex >= 0 &&
                        firstDisplayedCell.RowIndex < this.Rows.Count && 
                        firstDisplayedCell.ColumnIndex >= 0 &&
                        firstDisplayedCell.ColumnIndex < this.Columns.Count);

                    if (!firstDisplayedCell.Visible) 
                    {
                        throw new InvalidOperationException(SR.GetString(SR.DataGridView_FirstDisplayedCellCannotBeInvisible)); 
                    } 

                    if (!firstDisplayedCell.Frozen) 
                    {
                        if (!this.Rows[firstDisplayedCell.RowIndex].Frozen)
                        {
                            this.FirstDisplayedScrollingRowIndex = firstDisplayedCell.RowIndex; 
                        }
 
                        if (!this.Columns[firstDisplayedCell.ColumnIndex].Frozen) 
                        {
                            this.FirstDisplayedScrollingColumnIndex = firstDisplayedCell.ColumnIndex; 
                        }
                    }
                }
            } 
        }
 
        private Point FirstDisplayedCellAddress 
        {
            get 
            {
                Point ptFirstDisplayedCellAddress = new Point(-1, -1);
                ptFirstDisplayedCellAddress.Y = this.Rows.GetFirstRow(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen);
                if (ptFirstDisplayedCellAddress.Y == -1) 
                {
                    Debug.Assert(this.displayedBandsInfo.NumTotallyDisplayedFrozenRows == 0); 
                    if (this.displayedBandsInfo.FirstDisplayedScrollingRow >= 0) 
                    {
                        ptFirstDisplayedCellAddress.Y = this.displayedBandsInfo.FirstDisplayedScrollingRow; 
                    }
#if DEBUG
                    else
                    { 
                        Debug.Assert(this.displayedBandsInfo.FirstDisplayedScrollingRow == -1);
                        Debug.Assert(this.displayedBandsInfo.NumDisplayedScrollingRows == 0); 
                        Debug.Assert(this.displayedBandsInfo.NumTotallyDisplayedScrollingRows == 0); 
                    }
#endif 
                }
                if (ptFirstDisplayedCellAddress.Y >= 0)
                {
                    ptFirstDisplayedCellAddress.X = this.FirstDisplayedColumnIndex; 
                }
                return ptFirstDisplayedCellAddress; 
            } 
        }
 
        internal int FirstDisplayedColumnIndex
        {
            get
            { 
                if (!this.IsHandleCreated)
                { 
                    return -1; 
                }
 
                int firstDisplayedColumnIndex = -1;
                DataGridViewColumn dataGridViewColumn = this.Columns.GetFirstColumn(DataGridViewElementStates.Visible);
                if (dataGridViewColumn != null)
                { 
                    if (dataGridViewColumn.Frozen)
                    { 
                        firstDisplayedColumnIndex = dataGridViewColumn.Index; 
                    }
                    else if (this.displayedBandsInfo.FirstDisplayedScrollingCol >= 0) 
                    {
                        firstDisplayedColumnIndex = this.displayedBandsInfo.FirstDisplayedScrollingCol;
                    }
                } 
#if DEBUG
                DataGridViewColumn dataGridViewColumnDbg1 = this.Columns.GetFirstColumn(DataGridViewElementStates.Displayed); 
                int firstDisplayedColumnIndexDbg1 = (dataGridViewColumnDbg1 == null) ? -1 : dataGridViewColumnDbg1.Index; 

                int firstDisplayedColumnIndexDbg2 = -1; 
                DataGridViewColumn dataGridViewColumnDbg = this.Columns.GetFirstColumn(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen);
                if (dataGridViewColumnDbg != null)
                {
                    firstDisplayedColumnIndexDbg2 = dataGridViewColumnDbg.Index; 
                }
                else if (this.displayedBandsInfo.FirstDisplayedScrollingCol >= 0) 
                { 
                    firstDisplayedColumnIndexDbg2 = this.displayedBandsInfo.FirstDisplayedScrollingCol;
                } 
                else
                {
                    Debug.Assert(this.displayedBandsInfo.LastTotallyDisplayedScrollingCol == -1);
                } 
                Debug.Assert(firstDisplayedColumnIndex == firstDisplayedColumnIndexDbg1 || !this.Visible || this.displayedBandsInfo.Dirty);
                Debug.Assert(firstDisplayedColumnIndex == firstDisplayedColumnIndexDbg2 || this.displayedBandsInfo.Dirty); 
#endif 
                return firstDisplayedColumnIndex;
            } 
        }

        internal int FirstDisplayedRowIndex
        { 
            get
            { 
                if (!this.IsHandleCreated) 
                {
                    return -1; 
                }

                int firstDisplayedRowIndex = this.Rows.GetFirstRow(DataGridViewElementStates.Visible);
                if (firstDisplayedRowIndex != -1) 
                {
                    if ((this.Rows.GetRowState(firstDisplayedRowIndex) & DataGridViewElementStates.Frozen) == 0 && 
                        this.displayedBandsInfo.FirstDisplayedScrollingRow >= 0) 
                    {
                        firstDisplayedRowIndex = this.displayedBandsInfo.FirstDisplayedScrollingRow; 
                    }
                }
#if FALSE //DEBUG
                int firstDisplayedRowIndexDbg1 = this.Rows.GetFirstRow(DataGridViewElementStates.Displayed); 

                int firstDisplayedRowIndexDbg2 = this.Rows.GetFirstRow(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen); 
                if (firstDisplayedRowIndexDbg2 == -1) 
                {
                    if (this.displayedBandsInfo.FirstDisplayedScrollingRow >= 0) 
                    {
                        firstDisplayedRowIndexDbg2 = this.displayedBandsInfo.FirstDisplayedScrollingRow;
                    }
                } 

                Debug.Assert(firstDisplayedRowIndex == firstDisplayedRowIndexDbg1 || !this.Visible || this.displayedBandsInfo.Dirty, "firstDisplayedRowIndex =" + firstDisplayedRowIndex.ToString() + ", firstDisplayedRowIndexDbg1=" + firstDisplayedRowIndexDbg1.ToString()); 
                Debug.Assert(firstDisplayedRowIndex == firstDisplayedRowIndexDbg2 || this.displayedBandsInfo.Dirty, "firstDisplayedRowIndex =" + firstDisplayedRowIndex.ToString() + ", firstDisplayedRowIndexDbg2=" + firstDisplayedRowIndexDbg2.ToString()); 
#endif
                return firstDisplayedRowIndex; 
            }
        }

        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public int FirstDisplayedScrollingColumnHiddenWidth
        {
            get
            { 
                return this.negOffset;
            } 
        } 

        ///  
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public int FirstDisplayedScrollingColumnIndex
        { 
            get 
            {
                return this.displayedBandsInfo.FirstDisplayedScrollingCol; 
            }
            set
            {
                if (value < 0 || value >= this.Columns.Count) 
                {
                    throw new ArgumentOutOfRangeException("value"); 
                } 
                if (!this.Columns[value].Visible)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_FirstDisplayedScrollingColumnCannotBeInvisible));
                }
                if (this.Columns[value].Frozen)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_FirstDisplayedScrollingColumnCannotBeFrozen));
                } 
 
                if (!this.IsHandleCreated)
                { 
                    CreateHandle();
                }

                int displayWidth = this.layout.Data.Width; 
                if (displayWidth <= 0)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_NoRoomForDisplayedColumns)); 
                }
 
                int totalVisibleFrozenWidth = this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen);
                if (totalVisibleFrozenWidth >= displayWidth)
                {
                    Debug.Assert(totalVisibleFrozenWidth > 0); 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_FrozenColumnsPreventFirstDisplayedScrollingColumn));
                } 
 
                if (value == this.displayedBandsInfo.FirstDisplayedScrollingCol)
                { 
                    return;
                }

                if (this.ptCurrentCell.X >= 0 && 
                    !CommitEdit(DataGridViewDataErrorContexts.Parsing | DataGridViewDataErrorContexts.Commit | DataGridViewDataErrorContexts.Scroll,
                                false /*forCurrentCellChange*/, false /*forCurrentRowChange*/)) 
                { 
                    // Could not commit edited cell value - return silently
                    // [....]: should we throw an error here? 
                    return;
                }
                if (IsColumnOutOfBounds(value))
                { 
                    return;
                } 
                bool success = ScrollColumnIntoView(value, -1, /*committed*/ true, false /*forCurrentCellChange*/); 
                Debug.Assert(success);
 
                Debug.Assert(this.displayedBandsInfo.FirstDisplayedScrollingCol >= 0);
                Debug.Assert(this.displayedBandsInfo.FirstDisplayedScrollingCol == value ||
                             this.Columns.DisplayInOrder(this.displayedBandsInfo.FirstDisplayedScrollingCol, value));
                int maxHorizontalOffset = this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible) - displayWidth; 
                while (this.displayedBandsInfo.FirstDisplayedScrollingCol != value &&
                        this.HorizontalOffset < maxHorizontalOffset) 
                { 
                    ScrollColumns(1);
                } 
            }
        }

        ///  
        [
            Browsable(false), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public int FirstDisplayedScrollingRowIndex 
        {
            get
            {
                return this.displayedBandsInfo.FirstDisplayedScrollingRow; 
            }
            set 
            { 
                if (value < 0 || value >= this.Rows.Count)
                { 
                    throw new ArgumentOutOfRangeException("value");
                }
                if ((this.Rows.GetRowState(value) & DataGridViewElementStates.Visible) == 0)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_FirstDisplayedScrollingRowCannotBeInvisible));
                } 
                if ((this.Rows.GetRowState(value) & DataGridViewElementStates.Frozen) != 0) 
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_FirstDisplayedScrollingRowCannotBeFrozen)); 
                }

                if (!this.IsHandleCreated)
                { 
                    CreateHandle();
                } 
 
                int displayHeight = this.layout.Data.Height;
                if (displayHeight <= 0) 
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_NoRoomForDisplayedRows));
                }
 
                int totalVisibleFrozenHeight = this.Rows.GetRowsHeight(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen);
                if (totalVisibleFrozenHeight >= displayHeight) 
                { 
                    Debug.Assert(totalVisibleFrozenHeight > 0);
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_FrozenRowsPreventFirstDisplayedScrollingRow)); 
                }

                if (value == this.displayedBandsInfo.FirstDisplayedScrollingRow)
                { 
                    return;
                } 
 
                if (this.ptCurrentCell.X >= 0 &&
                    !CommitEdit(DataGridViewDataErrorContexts.Parsing | DataGridViewDataErrorContexts.Commit | DataGridViewDataErrorContexts.Scroll, 
                                false /*forCurrentCellChange*/, false /*forCurrentRowChange*/))
                {
                    // Could not commit edited cell value - return silently
                    // [....]: should we throw an error here? 
                    return;
                } 
                if (IsRowOutOfBounds(value)) 
                {
                    return; 
                }

                Debug.Assert(this.displayedBandsInfo.FirstDisplayedScrollingRow >= 0);
 
                if (value > this.displayedBandsInfo.FirstDisplayedScrollingRow)
                { 
                    int rowsToScroll = this.Rows.GetRowCount(DataGridViewElementStates.Visible, this.displayedBandsInfo.FirstDisplayedScrollingRow, value); 
                    Debug.Assert(rowsToScroll != 0);
                    ScrollRowsByCount(rowsToScroll, rowsToScroll > 1 ? ScrollEventType.LargeIncrement : ScrollEventType.SmallIncrement); 
                }
                else
                {
                    bool success = ScrollRowIntoView(-1, value, /*committed*/ true, false /*forCurrentCellChange*/); 
                    Debug.Assert(success);
                } 
            } 
        }
 
        /// 
        /// 
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ] 
        public override Color ForeColor
        { 
            get
            {
                return base.ForeColor;
            } 
            set
            { 
                base.ForeColor = value; 
            }
        } 

        /// 
        /// 
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ] 
        new public event EventHandler ForeColorChanged
        { 
            add
            {
                base.ForeColorChanged += value;
            } 
            remove
            { 
                base.ForeColorChanged -= value; 
            }
        } 

        /// 
        /// 
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ] 
        public override Font Font
        { 
            get
            {
                return base.Font;
            } 
            set
            { 
                base.Font = value; 
            }
        } 

        /// 
        /// 
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ] 
        new public event EventHandler FontChanged
        { 
            add
            {
                base.FontChanged += value;
            } 
            remove
            { 
                base.FontChanged -= value; 
            }
        } 

        /// 
        /// 
        ///    Gets or sets the grid color of the dataGridView (when Single mode is used). 
        /// 
        [ 
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridViewGridColorDescr)
        ] 
        public Color GridColor
        {
            get
            { 
                return this.gridPen.Color;
            } 
            set 
            {
                if (value.IsEmpty) 
                {
                    throw new ArgumentException(SR.GetString(SR.DataGridView_EmptyColor, "GridColor"));
                }
                if (value.A < 255) 
                {
                    throw new ArgumentException(SR.GetString(SR.DataGridView_TransparentColor, "GridColor")); 
                } 
                if (!value.Equals(this.gridPen.Color))
                { 
                    this.gridPen = new Pen(value);
                    OnGridColorChanged(EventArgs.Empty);
                }
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridViewOnGridColorChangedDescr)
        ]
        public event EventHandler GridColorChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWGRIDCOLORCHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWGRIDCOLORCHANGED, value);
            }
        } 

        ///  
        private bool ShouldSerializeGridColor() 
        {
            return !this.GridPen.Color.Equals(DefaultGridColor); 
        }

        internal Pen GridPen
        { 
            get
            { 
                return this.gridPen; 
            }
        } 

        internal int HorizontalOffset
        {
            get 
            {
                return this.horizontalOffset; 
            } 
            set
            { 
                if (value < 0)
                {
                    value = 0;
                } 
                int widthNotVisible = this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible) - this.layout.Data.Width;
                if (value > widthNotVisible && widthNotVisible > 0) 
                { 
                    value = widthNotVisible;
                } 
                if (value == this.horizontalOffset)
                {
                    return;
                } 

                ScrollEventType scrollEventType; 
                int oldFirstVisibleScrollingCol = this.displayedBandsInfo.FirstDisplayedScrollingCol; 
                int change = this.horizontalOffset - value;
                if (this.horizScrollBar.Enabled) 
                {
                    this.horizScrollBar.Value = value;
                }
                this.horizontalOffset = value; 

                int totalVisibleFrozenWidth = this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen); 
 
                Rectangle rectTmp = this.layout.Data;
                if (this.layout.ColumnHeadersVisible) 
                {
                    // column headers must scroll as well
                    rectTmp = Rectangle.Union(rectTmp, this.layout.ColumnHeaders);
                } 
                else if (this.SingleVerticalBorderAdded)
                { 
                    if (!this.RightToLeftInternal) 
                    {
                        rectTmp.X--; 
                    }
                    rectTmp.Width++;
                }
 
                if (this.SingleVerticalBorderAdded &&
                    totalVisibleFrozenWidth > 0) 
                { 
                    if (!this.RightToLeftInternal)
                    { 
                        rectTmp.X++;
                    }
                    rectTmp.Width--;
                } 

                if (!this.RightToLeftInternal) 
                { 
                    rectTmp.X += totalVisibleFrozenWidth;
                } 
                rectTmp.Width -= totalVisibleFrozenWidth;

                this.displayedBandsInfo.FirstDisplayedScrollingCol = ComputeFirstVisibleScrollingColumn();
                // update the lastTotallyDisplayedScrollingCol 
                ComputeVisibleColumns();
 
                if (this.editingControl != null && 
                    !this.Columns[this.ptCurrentCell.X].Frozen &&
                    this.displayedBandsInfo.FirstDisplayedScrollingCol > -1) 
                {
                    PositionEditingControl(true /*setLocation*/, false /*setSize*/, false /*setFocus*/);
                }
 
                // The mouse probably is not over the same cell after the scroll.
                UpdateMouseEnteredCell(null /*HitTestInfo*/, null /*MouseEventArgs*/); 
 
                if (oldFirstVisibleScrollingCol == this.displayedBandsInfo.FirstDisplayedScrollingCol)
                { 
                    scrollEventType = change > 0 ? ScrollEventType.SmallIncrement : ScrollEventType.SmallDecrement;
                }
                else if (this.Columns.DisplayInOrder(oldFirstVisibleScrollingCol, this.displayedBandsInfo.FirstDisplayedScrollingCol))
                { 
                    scrollEventType = this.Columns.GetColumnCount(DataGridViewElementStates.Visible, oldFirstVisibleScrollingCol, this.displayedBandsInfo.FirstDisplayedScrollingCol) > 1 ? ScrollEventType.LargeIncrement : ScrollEventType.SmallIncrement;
                } 
                else 
                {
                    Debug.Assert(this.Columns.DisplayInOrder(this.displayedBandsInfo.FirstDisplayedScrollingCol, oldFirstVisibleScrollingCol)); 
                    scrollEventType = this.Columns.GetColumnCount(DataGridViewElementStates.Visible, this.displayedBandsInfo.FirstDisplayedScrollingCol, oldFirstVisibleScrollingCol) > 1 ? ScrollEventType.LargeDecrement : ScrollEventType.SmallDecrement;
                }

                NativeMethods.RECT[] rects = CreateScrollableRegion(rectTmp); 
                if (this.RightToLeftInternal)
                { 
                    change = -change; 
                }
                ScrollRectangles(rects, change); 
                if (!this.dataGridViewState2[DATAGRIDVIEWSTATE2_stopRaisingHorizontalScroll])
                {
                    OnScroll(scrollEventType, this.horizontalOffset + change, this.horizontalOffset, ScrollOrientation.HorizontalScroll);
                } 
                FlushDisplayedChanged();
            } 
        } 

        ///  
        protected ScrollBar HorizontalScrollBar
        {
            get
            { 
                return this.horizScrollBar;
            } 
        } 

        ///  
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public int HorizontalScrollingOffset
        { 
            get 
            {
                return this.horizontalOffset; 
            }
            set
            {
                // int widthNotVisible = this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible) - this.layout.Data.Width; 
                if (value < 0)
                { 
                    throw new ArgumentOutOfRangeException("HorizontalScrollingOffset", SR.GetString(SR.InvalidLowBoundArgumentEx, "HorizontalScrollingOffset", (value).ToString(CultureInfo.CurrentCulture), (0).ToString(CultureInfo.CurrentCulture))); 
                }
                // Intentionally ignoring the out of range situation. 
                // else if (value > widthNotVisible && widthNotVisible > 0)
                //{
                //    throw new ArgumentOutOfRangeException(SR.GetString(SR.DataGridView_PropertyTooLarge, "HorizontalScrollingOffset", (widthNotVisible).ToString()));
                //} 
                else if (value > 0 && (this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible) - this.layout.Data.Width) <= 0)
                { 
                    // Intentionally ignoring the case where dev tries to set value while there is no horizontal scrolling possible. 
                    // throw new ArgumentOutOfRangeException("HorizontalScrollingOffset", SR.GetString(SR.DataGridView_PropertyMustBeZero));
                    Debug.Assert(this.horizontalOffset == 0); 
                    return;
                }
                if (value == this.horizontalOffset)
                { 
                    return;
                } 
                this.HorizontalOffset = value; 
            }
        } 

        private System.Windows.Forms.Timer HorizScrollTimer
        {
            get 
            {
                if (this.horizScrollTimer == null) 
                { 
                    this.horizScrollTimer = new System.Windows.Forms.Timer();
                    this.horizScrollTimer.Tick += new System.EventHandler(HorizScrollTimer_Tick); 
                }
                return this.horizScrollTimer;
            }
        } 

        private bool InAdjustFillingColumns 
        { 
            get
            { 
                return this.dataGridViewOper[DATAGRIDVIEWOPER_inAdjustFillingColumn] || this.dataGridViewOper[DATAGRIDVIEWOPER_inAdjustFillingColumns];
            }
        }
 
        internal bool InBeginEdit
        { 
            get 
            {
                return this.dataGridViewOper[DATAGRIDVIEWOPER_inBeginEdit]; 
            }
        }

        internal bool InDisplayIndexAdjustments 
        {
            get 
            { 
                return this.dataGridViewOper[DATAGRIDVIEWOPER_inDisplayIndexAdjustments];
            } 
            set
            {
                this.dataGridViewOper[DATAGRIDVIEWOPER_inDisplayIndexAdjustments] = value;
            } 
        }
 
        internal bool InEndEdit 
        {
            get 
            {
                return this.dataGridViewOper[DATAGRIDVIEWOPER_inEndEdit];
            }
        } 

        private DataGridViewCellStyle InheritedEditingCellStyle 
        { 
            get
            { 
                if (this.ptCurrentCell.X == -1)
                {
                    return null;
                } 

                return this.CurrentCellInternal.GetInheritedStyleInternal(this.ptCurrentCell.Y); 
            } 
        }
 
        internal bool InInitialization
        {
            get
            { 
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_initializing];
            } 
        } 

        internal bool InSortOperation 
        {
            get
            {
                return this.dataGridViewOper[DATAGRIDVIEWOPER_inSort]; 
            }
        } 
 
        /// 
        [Browsable(false)] 
        public bool IsCurrentCellDirty
        {
            get
            { 
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedCellChanged];
            } 
        } 

        private bool IsCurrentCellDirtyInternal 
        {
            set
            {
                if (value != this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedCellChanged]) 
                {
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedCellChanged] = value; 
                    OnCurrentCellDirtyStateChanged(EventArgs.Empty); 
                }
            } 
        }

        /// 
        [Browsable(false)] 
        public bool IsCurrentCellInEditMode
        { 
            get 
            {
                return this.editingControl != null || this.dataGridViewState1[DATAGRIDVIEWSTATE1_currentCellInEditMode]; 
            }
        }

        ///  
        // Only used in bound scenarios, when binding to a IEditableObject
        [Browsable(false)] 
        public bool IsCurrentRowDirty 
        {
            get 
            {
                if (!this.VirtualMode)
                {
                    return this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedRowChanged] || this.IsCurrentCellDirty; 
                }
                else 
                { 
                    QuestionEventArgs qe = new QuestionEventArgs(this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedRowChanged] || this.IsCurrentCellDirty);
                    OnRowDirtyStateNeeded(qe); 
                    return qe.Response;
                }
            }
        } 

        internal bool IsCurrentRowDirtyInternal 
        { 
            set
            { 
                if (value != this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedRowChanged])
                {
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_editedRowChanged] = value;
                    if (this.RowHeadersVisible && this.ShowEditingIcon && this.ptCurrentCell.Y >= 0) 
                    {
                        // Force the pencil to appear in the row header 
                        InvalidateCellPrivate(-1, this.ptCurrentCell.Y); 
                    }
                } 
            }
        }

        private bool IsEscapeKeyEffective 
        {
            get 
            { 
                return this.dataGridViewOper[DATAGRIDVIEWOPER_trackColResize] ||
                       this.dataGridViewOper[DATAGRIDVIEWOPER_trackRowResize] || 
                       this.dataGridViewOper[DATAGRIDVIEWOPER_trackColHeadersResize] ||
                       this.dataGridViewOper[DATAGRIDVIEWOPER_trackRowHeadersResize] ||
                       this.dataGridViewOper[DATAGRIDVIEWOPER_trackColRelocation] ||
                       this.IsCurrentCellDirty || 
                       ((this.VirtualMode || this.DataSource != null) && this.IsCurrentRowDirty) ||
                       (this.EditMode != DataGridViewEditMode.EditOnEnter && this.editingControl != null || 
                       this.dataGridViewState1[DATAGRIDVIEWSTATE1_newRowEdited]); 
            }
        } 

        private bool IsMinimized
        {
            get 
            {
                Form parentForm = this.TopLevelControlInternal as Form; 
                return parentForm != null && parentForm.WindowState == FormWindowState.Minimized; 
            }
        } 

        internal bool IsRestricted
        {
            get 
            {
                if (!this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestrictedChecked]) 
                { 
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestricted] = false;
                    try 
                    {
                        IntSecurity.AllWindows.Demand();
                    }
                    catch (SecurityException) 
                    {
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestricted] = true; 
                    } 
                    catch
                    { 
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestricted] = true; // To be on the safe side
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestrictedChecked] = true;
                        throw;
                    } 
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestrictedChecked] = true;
                } 
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_isRestricted]; 
            }
        } 

        private bool IsSharedCellReadOnly(DataGridViewCell dataGridViewCell, int rowIndex)
        {
            Debug.Assert(dataGridViewCell != null); 
            Debug.Assert(rowIndex >= 0);
            DataGridViewElementStates rowState = this.Rows.GetRowState(rowIndex); 
            return this.ReadOnly || 
                   (rowState & DataGridViewElementStates.ReadOnly) != 0 ||
                   (dataGridViewCell.OwningColumn != null && dataGridViewCell.OwningColumn.ReadOnly) || 
                   dataGridViewCell.StateIncludes(DataGridViewElementStates.ReadOnly);
        }

        internal bool IsSharedCellSelected(DataGridViewCell dataGridViewCell, int rowIndex) 
        {
            Debug.Assert(dataGridViewCell != null); 
            Debug.Assert(rowIndex >= 0); 
            DataGridViewElementStates rowState = this.Rows.GetRowState(rowIndex);
            return (rowState & DataGridViewElementStates.Selected) != 0 || 
                   (dataGridViewCell.OwningColumn != null && dataGridViewCell.OwningColumn.Selected) ||
                   dataGridViewCell.StateIncludes(DataGridViewElementStates.Selected);
        }
 
        internal bool IsSharedCellVisible(DataGridViewCell dataGridViewCell, int rowIndex)
        { 
            Debug.Assert(dataGridViewCell != null); 
            Debug.Assert(rowIndex >= 0);
            DataGridViewElementStates rowState = this.Rows.GetRowState(rowIndex); 
            return (rowState & DataGridViewElementStates.Visible) != 0 &&
                   (dataGridViewCell.OwningColumn != null && dataGridViewCell.OwningColumn.Visible);
        }
 
        internal LayoutData LayoutInfo
        { 
            get 
            {
                if (this.layout.dirty && this.IsHandleCreated) 
                {
                    PerformLayoutPrivate(false /*useRowShortcut*/, true /*computeVisibleRows*/, false /*invalidInAdjustFillingColumns*/, false /*repositionEditingControl*/);
                }
                return this.layout; 
            }
        } 
 
        internal Point MouseDownCellAddress
        { 
            get
            {
                return this.ptMouseDownCell;
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatBehavior), 
            DefaultValue(true),
            SRDescription(SR.DataGridView_MultiSelectDescr)
        ]
        public bool MultiSelect 
        {
            get 
            { 
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_multiSelect];
            } 
            set
            {
                if (this.MultiSelect != value)
                { 
                    ClearSelection();
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_multiSelect] = value; 
                    OnMultiSelectChanged(EventArgs.Empty); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewOnMultiSelectChangedDescr) 
        ] 
        public event EventHandler MultiSelectChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWMULTISELECTCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWMULTISELECTCHANGED, value); 
            }
        } 

        /// 
        [
            Browsable(false), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public int NewRowIndex 
        {
            get 
            {
                return this.newRowIndex;
            }
        } 

        internal bool NoDimensionChangeAllowed 
        { 
            get
            { 
                return this.noDimensionChangeCount > 0;
            }
        }
 
        private int NoSelectionChangeCount
        { 
            get 
            {
                return this.noSelectionChangeCount; 
            }
            set
            {
                Debug.Assert(value >= 0); 
                this.noSelectionChangeCount = value;
                if (value == 0) 
                { 
                    FlushSelectionChanged();
                } 
            }
        }

        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Never), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public new Padding Padding
        {
            get
            { 
                return base.Padding;
            } 
            set 
            {
                base.Padding = value; 
            }
        }

        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Never), 
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public new event EventHandler PaddingChanged
        {
            add
            { 
                base.PaddingChanged += value;
            } 
            remove 
            {
                base.PaddingChanged -= value; 
            }
        }

        internal DataGridViewCellStyle PlaceholderCellStyle 
        {
            get 
            { 
                if (this.placeholderCellStyle == null)
                { 
                    this.placeholderCellStyle = new DataGridViewCellStyle();
                }
                return this.placeholderCellStyle;
            } 
        }
 
        ///  
        [
            Browsable(true), 
            DefaultValue(false),
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_ReadOnlyDescr)
        ] 
        public bool ReadOnly
        { 
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_readOnly]; 
            }
            set
            {
                if (value != this.dataGridViewState1[DATAGRIDVIEWSTATE1_readOnly]) 
                {
                    if (value && 
                        this.ptCurrentCell.X != -1 && 
                        this.IsCurrentCellInEditMode)
                    { 
                        // Current cell becomes read-only. Exit editing mode.
                        if (!EndEdit(DataGridViewDataErrorContexts.Parsing | DataGridViewDataErrorContexts.Commit,
                                     DataGridViewValidateCellInternal.Always /*validateCell*/,
                                     false /*fireCellLeave*/, 
                                     false /*fireCellEnter*/,
                                     false /*fireRowLeave*/, 
                                     false /*fireRowEnter*/, 
                                     false /*fireLeave*/,
                                     true /*keepFocus*/, 
                                     false /*resetCurrentCell*/,
                                     false /*resetAnchorCell*/))
                        {
                            throw new InvalidOperationException(SR.GetString(SR.DataGridView_CommitFailedCannotCompleteOperation)); 
                        }
                    } 
 
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_readOnly] = value;
 
                    if (value)
                    {
                        try
                        { 
                            this.dataGridViewOper[DATAGRIDVIEWOPER_inReadOnlyChange] = true;
                            for (int columnIndex = 0; columnIndex < this.Columns.Count; columnIndex++) 
                            { 
                                SetReadOnlyColumnCore(columnIndex, false);
                            } 
                            int rowCount = this.Rows.Count;
                            for (int rowIndex = 0; rowIndex < rowCount; rowIndex++)
                            {
                                SetReadOnlyRowCore(rowIndex, false); 
                            }
                        } 
                        finally 
                        {
                            this.dataGridViewOper[DATAGRIDVIEWOPER_inReadOnlyChange] = false; 
                        }
                    }
#if DEBUG
                    else 
                    {
                        Debug.Assert(this.individualReadOnlyCells.Count == 0); 
                        for (int columnIndex = 0; columnIndex < this.Columns.Count; columnIndex++) 
                        {
                            Debug.Assert(this.Columns[columnIndex].ReadOnly == false); 
                        }
                        int rowCount = this.Rows.Count;
                        for (int rowIndex = 0; rowIndex < rowCount; rowIndex++)
                        { 
                            Debug.Assert((this.Rows.GetRowState(rowIndex) & DataGridViewElementStates.ReadOnly) == 0);
                        } 
                    } 
#endif
                    OnReadOnlyChanged(EventArgs.Empty); 
                }
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridViewOnReadOnlyChangedDescr)
        ] 
        public event EventHandler ReadOnlyChanged
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWREADONLYCHANGED, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWREADONLYCHANGED, value); 
            }
        }

        private void ResetCurrentCell() 
        {
            if (this.ptCurrentCell.X != -1 && 
                !SetCurrentCellAddressCore(-1, -1, true /*setAnchorCellAddress*/, true /*validateCurrentCell*/, false /*throughMouseClick*/)) 
            {
                // Edited value couldn't be committed or aborted 
                throw new InvalidOperationException(SR.GetString(SR.DataGridView_CellChangeCannotBeCommittedOrAborted));
            }
        }
 
        internal bool ResizingOperationAboutToStart
        { 
            get 
            {
                return this.dataGridViewOper[DATAGRIDVIEWOPER_resizingOperationAboutToStart]; 
            }
        }

        internal bool RightToLeftInternal 
        {
            get 
            { 
                if (this.dataGridViewState2[DATAGRIDVIEWSTATE2_rightToLeftValid])
                { 
                    return this.dataGridViewState2[DATAGRIDVIEWSTATE2_rightToLeftMode];
                }
                this.dataGridViewState2[DATAGRIDVIEWSTATE2_rightToLeftMode] = (this.RightToLeft == RightToLeft.Yes);
                this.dataGridViewState2[DATAGRIDVIEWSTATE2_rightToLeftValid] = true; 
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_rightToLeftMode];
            } 
        } 

        ///  
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            DefaultValue(0)
        ] 
        public int RowCount 
        {
            get 
            {
                return this.Rows.Count;
            }
            set 
            {
                if (this.AllowUserToAddRowsInternal) 
                { 
                    if (value < 1)
                    { 
                        throw new ArgumentOutOfRangeException("RowCount", SR.GetString(SR.InvalidLowBoundArgumentEx, "RowCount", value.ToString(CultureInfo.CurrentCulture), (1).ToString(CultureInfo.CurrentCulture)));
                    }
                }
                else 
                {
                    if (value < 0) 
                    { 
                        throw new ArgumentOutOfRangeException("RowCount", SR.GetString(SR.InvalidLowBoundArgumentEx, "RowCount", value.ToString(CultureInfo.CurrentCulture), (0).ToString(CultureInfo.CurrentCulture)));
                    } 
                }
                if (this.DataSource != null)
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridView_CannotSetRowCountOnDataBoundDataGridView)); 
                }
                if (value != this.Rows.Count) 
                { 
                    if (value == 0)
                    { 
                        // Total removal of the rows.
                        this.Rows.Clear();
                    }
                    else if (value < this.Rows.Count) 
                    {
                        // Some rows need to be removed, from the tail of the rows collection 
                        while (value < this.Rows.Count) 
                        {
                            int currentRowCount = this.Rows.Count; 
                            this.Rows.RemoveAt(currentRowCount - (this.AllowUserToAddRowsInternal ? 2 :  1));
                            if (this.Rows.Count >= currentRowCount)
                            {
                                // Row removal failed. We stop the loop. 
                                break;
                            } 
                        } 
                    }
                    else 
                    {
                        // Some rows need to be appened.
                        if (this.Columns.Count == 0)
                        { 
                            // There are no columns yet, we simply create a single DataGridViewTextBoxColumn.
                            DataGridViewTextBoxColumn dataGridViewTextBoxColumn = new DataGridViewTextBoxColumn(); 
                            this.Columns.Add(dataGridViewTextBoxColumn); 
                        }
                        int rowsToAdd = value - this.Rows.Count; 
                        if (rowsToAdd > 0)
                        {
                            this.Rows.Add(rowsToAdd);
                        } 
                    }
                } 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_RowHeadersBorderStyleDescr), 
            Browsable(true),
            DefaultValue(DataGridViewHeaderBorderStyle.Raised) 
        ] 
        public DataGridViewHeaderBorderStyle RowHeadersBorderStyle
        { 
            get
            {
                switch (this.advancedRowHeadersBorderStyle.All)
                { 
                    case DataGridViewAdvancedCellBorderStyle.NotSet:
                        return DataGridViewHeaderBorderStyle.Custom; 
 
                    case DataGridViewAdvancedCellBorderStyle.None:
                        return DataGridViewHeaderBorderStyle.None; 

                    case DataGridViewAdvancedCellBorderStyle.Single:
                        return DataGridViewHeaderBorderStyle.Single;
 
                    case DataGridViewAdvancedCellBorderStyle.InsetDouble:
                        return DataGridViewHeaderBorderStyle.Sunken; 
 
                    case DataGridViewAdvancedCellBorderStyle.OutsetPartial:
                        return DataGridViewHeaderBorderStyle.Raised; 

                    default:
                        return DataGridViewHeaderBorderStyle.Custom;
                } 
            }
            set 
            { 
                // Sequential enum.  Valid values are 0x0 to 0x4
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewHeaderBorderStyle.Custom, (int)DataGridViewHeaderBorderStyle.None)) 
                {
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewHeaderBorderStyle));
                }
 
                if (value != this.RowHeadersBorderStyle)
                { 
                    if (value == DataGridViewHeaderBorderStyle.Custom) 
                    {
                        throw new ArgumentException(SR.GetString(SR.DataGridView_CustomCellBorderStyleInvalid, "RowHeadersBorderStyle")); 
                    }
                    this.dataGridViewOper[DATAGRIDVIEWOPER_inBorderStyleChange] = true;
                    try
                    { 
                        switch (value)
                        { 
                            case DataGridViewHeaderBorderStyle.Single: 
                                this.advancedRowHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.Single;
                                break; 

                            case DataGridViewHeaderBorderStyle.Raised:
                                this.advancedRowHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.OutsetPartial;
                                break; 

                            case DataGridViewHeaderBorderStyle.Sunken: 
                                this.advancedRowHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.InsetDouble; 
                                break;
 
                            case DataGridViewHeaderBorderStyle.None:
                                this.advancedRowHeadersBorderStyle.All = DataGridViewAdvancedCellBorderStyle.None;
                                break;
                        } 
                    }
                    finally 
                    { 
                        this.dataGridViewOper[DATAGRIDVIEWOPER_inBorderStyleChange] = false;
                    } 
                    OnRowHeadersBorderStyleChanged(EventArgs.Empty);
                }
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_RowHeadersBorderStyleChangedDescr) 
        ]
        public event EventHandler RowHeadersBorderStyleChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERSBORDERSTYLECHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERSBORDERSTYLECHANGED, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_RowHeadersDefaultCellStyleDescr),
            AmbientValue(null) 
        ]
        public DataGridViewCellStyle RowHeadersDefaultCellStyle
        {
            get 
            {
                if (this.rowHeadersDefaultCellStyle == null) 
                { 
                    this.rowHeadersDefaultCellStyle = this.DefaultRowHeadersDefaultCellStyle;
                } 
                return this.rowHeadersDefaultCellStyle;
            }
            set
            { 
                DataGridViewCellStyle cs = this.RowHeadersDefaultCellStyle;
                cs.RemoveScope(DataGridViewCellStyleScopes.RowHeaders); 
                this.rowHeadersDefaultCellStyle = value; 
                if (value != null)
                { 
                    this.rowHeadersDefaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.RowHeaders);
                }
                DataGridViewCellStyleDifferences dgvcsc = cs.GetDifferencesFrom(this.RowHeadersDefaultCellStyle);
                if (dgvcsc != DataGridViewCellStyleDifferences.None) 
                {
                    this.CellStyleChangedEventArgs.ChangeAffectsPreferredSize = (dgvcsc == DataGridViewCellStyleDifferences.AffectPreferredSize); 
                    OnRowHeadersDefaultCellStyleChanged(this.CellStyleChangedEventArgs); 
                }
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewRowHeadersDefaultCellStyleChangedDescr) 
        ] 
        public event EventHandler RowHeadersDefaultCellStyleChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERSDEFAULTCELLSTYLECHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERSDEFAULTCELLSTYLECHANGED, value); 
            }
        } 

        /// 
        /// 
        ///     
        ///       Gets or sets a value indicating whether the dataGridView's row headers are
        ///       visible. 
        ///     
        /// 
        [ 
            SRCategory(SR.CatAppearance),
            DefaultValue(true),
            SRDescription(SR.DataGridViewRowHeadersVisibleDescr)
        ] 
        public bool RowHeadersVisible
        { 
            get 
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_rowHeadersVisible]; 
            }
            set
            {
                if (this.RowHeadersVisible != value) 
                {
                    if (!value && 
                        (this.autoSizeRowsMode == DataGridViewAutoSizeRowsMode.AllHeaders || this.autoSizeRowsMode == DataGridViewAutoSizeRowsMode.DisplayedHeaders)) 
                    {
                        throw new InvalidOperationException(SR.GetString(SR.DataGridView_RowHeadersCannotBeInvisible)); 
                    }
                    using (LayoutTransaction.CreateTransactionIf(this.AutoSize, this.ParentInternal, this, PropertyNames.RowHeadersVisible))
                    {
                        this.dataGridViewState1[DATAGRIDVIEWSTATE1_rowHeadersVisible] = value; 
                        this.layout.RowHeadersVisible = value;
                        this.displayedBandsInfo.EnsureDirtyState(); 
                        if (!this.AutoSize) 
                        {
                            PerformLayoutPrivate(false /*useRowShortcut*/, false /*computeVisibleRows*/, true /*invalidInAdjustFillingColumns*/, true /*repositionEditingControl*/); 
                        }
                        InvalidateInside();
                        OnRowHeadersGlobalAutoSize(value /*expandingRows*/);
                    } 
                }
            } 
        } 

        ///  
        [
            SRCategory(SR.CatLayout),
            Localizable(true),
            SRDescription(SR.DataGridView_RowHeadersWidthDescr) 
        ]
        public int RowHeadersWidth 
        { 
            get
            { 
                return this.rowHeadersWidth;
            }
            set
            { 
                if (value < minimumRowHeadersWidth)
                { 
                    throw new ArgumentOutOfRangeException("RowHeadersWidth", SR.GetString(SR.InvalidLowBoundArgumentEx, "RowHeadersWidth", (value).ToString(CultureInfo.CurrentCulture), (minimumRowHeadersWidth).ToString(CultureInfo.CurrentCulture))); 
                }
                if (value > maxHeadersThickness) 
                {
                    throw new ArgumentOutOfRangeException("RowHeadersWidth", SR.GetString(SR.InvalidHighBoundArgumentEx, "RowHeadersWidth", (value).ToString(CultureInfo.CurrentCulture), (maxHeadersThickness).ToString(CultureInfo.CurrentCulture)));
                }
                if (this.RowHeadersWidthSizeMode != DataGridViewRowHeadersWidthSizeMode.EnableResizing && 
                    this.RowHeadersWidthSizeMode != DataGridViewRowHeadersWidthSizeMode.DisableResizing)
                { 
                    this.cachedRowHeadersWidth = value; 
                }
                else if (this.rowHeadersWidth != value) 
                {
                    this.RowHeadersWidthInternal = value;
                }
            } 
        }
 
        private int RowHeadersWidthInternal 
        {
            set 
            {
                using (LayoutTransaction.CreateTransactionIf(this.AutoSize, this.ParentInternal, this, PropertyNames.RowHeadersWidth))
                {
                    Debug.Assert(this.rowHeadersWidth != value); 
                    Debug.Assert(value >= minimumRowHeadersWidth);
                    this.rowHeadersWidth = value; 
                    if (this.AutoSize) 
                    {
                        InvalidateInside(); 
                    }
                    else
                    {
                        if (this.layout.RowHeadersVisible) 
                        {
                            PerformLayoutPrivate(false /*useRowShortcut*/, false /*computeVisibleRows*/, true /*invalidInAdjustFillingColumns*/, true /*repositionEditingControl*/); 
                            InvalidateInside(); 
                        }
                    } 
                    OnRowHeadersWidthChanged(EventArgs.Empty);
                }
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewRowHeadersWidthChangedDescr) 
        ]
        public event EventHandler RowHeadersWidthChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERSWIDTHCHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERSWIDTHCHANGED, value);
            }
        }
 
        private bool ShouldSerializeRowHeadersWidth()
        { 
            return (this.rowHeadersWidthSizeMode == DataGridViewRowHeadersWidthSizeMode.EnableResizing || this.rowHeadersWidthSizeMode == DataGridViewRowHeadersWidthSizeMode.DisableResizing) && 
                   defaultRowHeadersWidth != this.RowHeadersWidth;
        } 

        /// 
        /// 
        ///     
        ///       Gets or sets a value that determines the behavior for adjusting the row headers width.
        ///     
        ///  
        [
            DefaultValue(DataGridViewRowHeadersWidthSizeMode.EnableResizing), 
            RefreshProperties(RefreshProperties.All),
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_RowHeadersWidthSizeModeDescr)
        ] 
        public DataGridViewRowHeadersWidthSizeMode RowHeadersWidthSizeMode
        { 
            get 
            {
                return this.rowHeadersWidthSizeMode; 
            }
            set
            {
                // Sequential enum.  Valid values are 0x0 to 0x4 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewRowHeadersWidthSizeMode.EnableResizing, (int)DataGridViewRowHeadersWidthSizeMode.AutoSizeToFirstHeader))
                { 
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewRowHeadersWidthSizeMode)); 
                }
                if (this.rowHeadersWidthSizeMode != value) 
                {
                    /*if (value != DataGridViewRowHeadersWidthSizeMode.EnableResizing &&
                     *    value != DataGridViewRowHeadersWidthSizeMode.DisableResizing &&
                     *    !this.RowHeadersVisible) 
                    {
                        We intentionally don't throw an error because of designer code spit order. 
                    }*/ 
                    DataGridViewAutoSizeModeEventArgs dgvasme = new DataGridViewAutoSizeModeEventArgs(this.rowHeadersWidthSizeMode != DataGridViewRowHeadersWidthSizeMode.EnableResizing &&
                                                                                                      this.rowHeadersWidthSizeMode != DataGridViewRowHeadersWidthSizeMode.DisableResizing); 
                    this.rowHeadersWidthSizeMode = value;
                    OnRowHeadersWidthSizeModeChanged(dgvasme);
                }
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_RowHeadersWidthSizeModeChangedDescr)
        ]
        public event DataGridViewAutoSizeModeEventHandler RowHeadersWidthSizeModeChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERSWIDTHSIZEMODECHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERSWIDTHSIZEMODECHANGED, value);
            }
        } 

        ///  
        [ 
            Browsable(false)
        ] 
        public DataGridViewRowCollection Rows
        {
            get
            { 
                if (this.dataGridViewRows == null)
                { 
                    this.dataGridViewRows = CreateRowsInstance(); 
                }
                return this.dataGridViewRows; 
            }
        }

        ///  
        [
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_RowsDefaultCellStyleDescr) 
        ]
        public DataGridViewCellStyle RowsDefaultCellStyle 
        {
            get
            {
                if (this.rowsDefaultCellStyle == null) 
                {
                    this.rowsDefaultCellStyle = new DataGridViewCellStyle(); 
                    this.rowsDefaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.Rows); 
                }
                return this.rowsDefaultCellStyle; 
            }
            set
            {
                DataGridViewCellStyle cs = this.RowsDefaultCellStyle; 
                cs.RemoveScope(DataGridViewCellStyleScopes.Rows);
                this.rowsDefaultCellStyle = value; 
                if (value != null) 
                {
                    this.rowsDefaultCellStyle.AddScope(this, DataGridViewCellStyleScopes.Rows); 
                }
                DataGridViewCellStyleDifferences dgvcsc = cs.GetDifferencesFrom(this.RowsDefaultCellStyle);
                if (dgvcsc != DataGridViewCellStyleDifferences.None)
                { 
                    this.CellStyleChangedEventArgs.ChangeAffectsPreferredSize = (dgvcsc == DataGridViewCellStyleDifferences.AffectPreferredSize);
                    OnRowsDefaultCellStyleChanged(this.CellStyleChangedEventArgs); 
                } 
            }
        } 

        /// 
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridViewRowsDefaultCellStyleChangedDescr)
        ] 
        public event EventHandler RowsDefaultCellStyleChanged 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWSDEFAULTCELLSTYLECHANGED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWSDEFAULTCELLSTYLECHANGED, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatAppearance),
            Browsable(true), 
            SRDescription(SR.DataGridView_RowTemplateDescr),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Content) 
        ] 
        public DataGridViewRow RowTemplate
        { 
            get
            {
                if (this.rowTemplate == null)
                { 
                    this.rowTemplate = new DataGridViewRow();
                } 
                return this.rowTemplate; 
            }
            set 
            {
                DataGridViewRow dataGridViewRow = value;
                if (dataGridViewRow != null)
                { 
                    if (dataGridViewRow.DataGridView != null)
                    { 
                        throw new InvalidOperationException(SR.GetString(SR.DataGridView_RowAlreadyBelongsToDataGridView)); 
                    }
                    //if (dataGridViewRow.Selected) 
                    //{
                    //    throw new InvalidOperationException(SR.GetString(SR.DataGridView_RowTemplateCannotBeSelected));
                    //}
                } 
                this.rowTemplate = dataGridViewRow;
            } 
        } 

        private bool ShouldSerializeRowTemplate() 
        {
            return this.rowTemplate != null;
        }
 
        internal DataGridViewRow RowTemplateClone
        { 
            get 
            {
                DataGridViewRow rowTemplateClone = (DataGridViewRow) this.RowTemplate.Clone(); 
                CompleteCellsCollection(rowTemplateClone);
                return rowTemplateClone;
            }
        } 

        ///  
        ///  
        ///     Possible return values are given by the ScrollBars enumeration.
        ///  
        [
            DefaultValue(ScrollBars.Both),
            Localizable(true),
            SRCategory(SR.CatLayout), 
            SRDescription(SR.DataGridView_ScrollBarsDescr)
        ] 
        public ScrollBars ScrollBars 
        {
            get 
            {
                return this.scrollBars;
            }
            set 
            {
                // Sequential enum.  Valid values are 0x0 to 0x3 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)ScrollBars.None, (int)ScrollBars.Both)) 
                {
                     throw new InvalidEnumArgumentException("value", (int)value, typeof(ScrollBars)); 
                }

                if (this.scrollBars != value)
                { 
                    using (LayoutTransaction.CreateTransactionIf(this.AutoSize, this.ParentInternal, this, PropertyNames.ScrollBars))
                    { 
                        // Before changing the value of this.scrollBars, we scroll to the top-left cell to 
                        // avoid inconsitent state of scrollbars.
                        DataGridViewColumn dataGridViewColumn = this.Columns.GetFirstColumn(DataGridViewElementStates.Visible); 
                        int firstVisibleRowIndex = this.Rows.GetFirstRow(DataGridViewElementStates.Visible);

                        if (dataGridViewColumn != null && firstVisibleRowIndex != -1)
                        { 
                            if (!ScrollIntoView(dataGridViewColumn.Index, firstVisibleRowIndex, false))
                            { 
                                throw new InvalidOperationException(SR.GetString(SR.DataGridView_CellChangeCannotBeCommittedOrAborted)); 
                            }
                        } 
                        Debug.Assert(this.HorizontalOffset == 0);
                        Debug.Assert(this.VerticalOffset == 0);

                        this.scrollBars = value; 

                        if (!this.AutoSize) 
                        { 
                            PerformLayoutPrivate(false /*useRowShortcut*/, false /*computeVisibleRows*/, true /*invalidInAdjustFillingColumns*/, true /*repositionEditingControl*/);
                        } 
                        Invalidate();
                    }
                }
            } 
        }
 
        ///  
        [
            Browsable(false) 
        ]
        public DataGridViewSelectedCellCollection SelectedCells
        {
            [ 
                SuppressMessage("Microsoft.Performance", "CA1817:DoNotCallPropertiesThatCloneValuesInLoops"), // not legitimate
                SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes") // consider using generics instead of DataGridViewIntLinkedList 
            ] 
            get
            { 
                DataGridViewSelectedCellCollection stcc = new DataGridViewSelectedCellCollection();
                switch (this.SelectionMode)
                {
                    case DataGridViewSelectionMode.CellSelect: 
                    {
                        // Note: If we change the design and decide that SelectAll() should use band selection, 
                        // we need to add those to the selected cells. 
                        stcc.AddCellLinkedList(this.individualSelectedCells);
                        break; 
                    }
                    case DataGridViewSelectionMode.FullColumnSelect:
                    case DataGridViewSelectionMode.ColumnHeaderSelect:
                    { 
                        foreach (int columnIndex in this.selectedBandIndexes)
                        { 
                            foreach (DataGridViewRow dataGridViewRow in this.Rows)   // unshares all rows! 
                            {
                                stcc.Add(dataGridViewRow.Cells[columnIndex]); 
                            }
                        }
                        if (this.SelectionMode == DataGridViewSelectionMode.ColumnHeaderSelect)
                        { 
                            stcc.AddCellLinkedList(this.individualSelectedCells);
                        } 
                        break; 
                    }
                    case DataGridViewSelectionMode.FullRowSelect: 
                    case DataGridViewSelectionMode.RowHeaderSelect:
                    {
                        foreach (int rowIndex in this.selectedBandIndexes)
                        { 
                            DataGridViewRow dataGridViewRow = (DataGridViewRow) this.Rows[rowIndex]; // unshares the selected row
                            foreach (DataGridViewCell dataGridViewCell in dataGridViewRow.Cells) 
                            { 
                                stcc.Add(dataGridViewCell);
                            } 
                        }
                        if (this.SelectionMode == DataGridViewSelectionMode.RowHeaderSelect)
                        {
                            stcc.AddCellLinkedList(this.individualSelectedCells); 
                        }
                        break; 
                    } 
                }
                return stcc; 
            }
        }

        ///  
        [
            Browsable(false) 
        ] 
        public DataGridViewSelectedColumnCollection SelectedColumns
        { 
            [
                SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes") // consider using generics instead of DataGridViewIntLinkedList
            ]
            get 
            {
                DataGridViewSelectedColumnCollection strc = new DataGridViewSelectedColumnCollection(); 
                switch (this.SelectionMode) 
                {
                    case DataGridViewSelectionMode.CellSelect: 
                    case DataGridViewSelectionMode.FullRowSelect:
                    case DataGridViewSelectionMode.RowHeaderSelect:
                        break;
                    case DataGridViewSelectionMode.FullColumnSelect: 
                    case DataGridViewSelectionMode.ColumnHeaderSelect:
                        foreach (int columnIndex in this.selectedBandIndexes) 
                        { 
                            strc.Add(this.Columns[columnIndex]);
                        } 
                        break;
                }
                return strc;
            } 
        }
 
        ///  
        [
            Browsable(false), 
        ]
        public DataGridViewSelectedRowCollection SelectedRows
        {
            [ 
                SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes"), // using specialized DataGridViewIntLinkedList class instead of generics
                SuppressMessage("Microsoft.Performance", "CA1817:DoNotCallPropertiesThatCloneValuesInLoops") // not legitimate 
            ] 
            get
            { 
                DataGridViewSelectedRowCollection strc = new DataGridViewSelectedRowCollection();
                switch (this.SelectionMode)
                {
                    case DataGridViewSelectionMode.CellSelect: 
                    case DataGridViewSelectionMode.FullColumnSelect:
                    case DataGridViewSelectionMode.ColumnHeaderSelect: 
                        break; 
                    case DataGridViewSelectionMode.FullRowSelect:
                    case DataGridViewSelectionMode.RowHeaderSelect: 
                        foreach (int rowIndex in this.selectedBandIndexes)
                        {
                            strc.Add((DataGridViewRow) this.Rows[rowIndex]); // unshares the selected row
                        } 
                        break;
                } 
                return strc; 
            }
        } 

        /// 
        [
            Browsable(true), 
            SRCategory(SR.CatBehavior),
            DefaultValue(DataGridViewSelectionMode.RowHeaderSelect), 
            SRDescription(SR.DataGridView_SelectionModeDescr) 
        ]
        public DataGridViewSelectionMode SelectionMode 
        {
            get
            {
                return this.selectionMode; 
            }
            set 
            { 
                // Sequential enum.  Valid values are 0x0 to 0x4
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)DataGridViewSelectionMode.CellSelect, (int)DataGridViewSelectionMode.ColumnHeaderSelect)) 
                {
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(DataGridViewSelectionMode));
                }
 
                if (this.SelectionMode != value)
                { 
                    if (!this.dataGridViewState2[DATAGRIDVIEWSTATE2_initializing] && 
                        (value == DataGridViewSelectionMode.FullColumnSelect || value == DataGridViewSelectionMode.ColumnHeaderSelect))
                    { 
                        foreach (DataGridViewColumn dataGridViewColumn in this.Columns)
                        {
                            if (dataGridViewColumn.SortMode == DataGridViewColumnSortMode.Automatic)
                            { 
                                throw new InvalidOperationException(SR.GetString(SR.DataGridView_SelectionModeAndSortModeClash, (value).ToString()));
                            } 
                        } 
                    }
                    ClearSelection(); 
                    this.selectionMode = value;
                }
            }
        } 

        ///  
        [ 
            DefaultValue(true),
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_ShowCellErrorsDescr)
        ]
        public bool ShowCellErrors
        { 
            get
            { 
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_showCellErrors]; 
            }
            set 
            {
                if (this.ShowCellErrors != value)
                {
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_showCellErrors] = value; 

                    // Put this into OnShowCellErrorsChanged if created. 
                    if (this.IsHandleCreated && !this.DesignMode) 
                    {
                        if (value && !this.ShowRowErrors && !this.ShowCellToolTips) 
                        {
                            // the tool tip hasn't yet been activated
                            // activate it now
                            this.toolTipControl.Activate(!String.IsNullOrEmpty(this.toolTipCaption)); 
                        }
 
                        if (!value && !this.ShowRowErrors && !this.ShowCellToolTips) 
                        {
                            // there is no reason to keep the tool tip activated 
                            // deactivate it
                            this.toolTipCaption = String.Empty;
                            this.toolTipControl.Activate(false /*activate*/);
                        } 

                        if (!value && (this.ShowRowErrors || this.ShowCellToolTips)) 
                        { 
                            // reset the tool tip
                            this.toolTipControl.Activate(!String.IsNullOrEmpty(this.toolTipCaption)); 
                        }

                        // Some autosizing may have to be applied since the potential presence of error icons influences the preferred sizes.
                        OnGlobalAutoSize(); 
                    }
 
                    if (!this.layout.dirty && !this.DesignMode) 
                    {
                        this.Invalidate(Rectangle.Union(this.layout.Data, this.layout.ColumnHeaders)); 
                        this.Invalidate(this.layout.TopLeftHeader);
                    }
                }
            } 
        }
 
        ///  
        [
            DefaultValue(true), 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_ShowCellToolTipsDescr)
        ]
        public bool ShowCellToolTips 
        {
            get 
            { 
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_showCellToolTips];
            } 
            set
            {
                if (this.ShowCellToolTips != value)
                { 
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_showCellToolTips] = value;
 
                    if (this.IsHandleCreated && !this.DesignMode) 
                    {
                        if (value && !this.ShowRowErrors && !this.ShowCellErrors) 
                        {
                            // the tool tip hasn't yet been activated
                            // activate it now
                            this.toolTipControl.Activate(!String.IsNullOrEmpty(this.toolTipCaption) /*activate*/); 
                        }
 
                        if (!value && !this.ShowRowErrors && !this.ShowCellErrors) 
                        {
                            // there is no reason to keep the tool tip activated 
                            // deactivate it
                            this.toolTipCaption = String.Empty;
                            this.toolTipControl.Activate(false /*activate*/);
                        } 

                        if (!value && (this.ShowRowErrors || this.ShowCellErrors)) 
                        { 
                            bool activate = !String.IsNullOrEmpty(this.toolTipCaption);
                            Point mouseCoord = System.Windows.Forms.Control.MousePosition; 
                            activate &= this.ClientRectangle.Contains(PointToClient(mouseCoord));

                            // reset the tool tip
                            this.toolTipControl.Activate(activate); 
                        }
                    } 
 
                    if (!this.layout.dirty && !this.DesignMode)
                    { 
                        Invalidate(this.layout.Data);
                    }
                }
            } 
        }
 
        ///  
        [
            DefaultValue(true), 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_ShowEditingIconDescr)
        ]
        public bool ShowEditingIcon 
        {
            get 
            { 
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_showEditingIcon];
            } 
            set
            {
                if (this.ShowEditingIcon != value)
                { 
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_showEditingIcon] = value;
 
                    // invalidate the row header to pick up the new ShowEditingIcon value 
                    if (this.RowHeadersVisible)
                    { 
                        if (this.VirtualMode || this.DataSource != null)
                        {
                            if (this.IsCurrentRowDirty)
                            { 
                                Debug.Assert(this.ptCurrentCell.Y >= 0);
                                InvalidateCellPrivate(-1, this.ptCurrentCell.Y); 
                            } 
                        }
                        else 
                        {
                            if (this.IsCurrentCellDirty) {
                                Debug.Assert(this.ptCurrentCell.Y >= 0);
                                InvalidateCellPrivate(-1, this.ptCurrentCell.Y); 
                            }
                        } 
                    } 
                }
            } 
        }

        /// 
        [ 
            DefaultValue(true),
            SRCategory(SR.CatAppearance), 
            SRDescription(SR.DataGridView_ShowRowErrorsDescr) 
        ]
        public bool ShowRowErrors 
        {
            get
            {
                return this.dataGridViewState2[DATAGRIDVIEWSTATE2_showRowErrors]; 
            }
            set 
            { 
                if (this.ShowRowErrors != value)
                { 
                    this.dataGridViewState2[DATAGRIDVIEWSTATE2_showRowErrors] = value;

                    if (this.IsHandleCreated && !this.DesignMode)
                    { 
                        if (value && !this.ShowCellErrors && !this.ShowCellToolTips)
                        { 
                            // the tool tip hasn't yet been activated 
                            // activate it now
                            this.toolTipControl.Activate(!String.IsNullOrEmpty(this.toolTipCaption)); 
                        }

                        if (!value && !this.ShowCellErrors && !this.ShowCellToolTips)
                        { 
                            // there is no reason to keep the tool tip activated
                            // deactivate it 
                            this.toolTipCaption = String.Empty; 
                            this.toolTipControl.Activate(false /*activate*/);
                        } 

                        if (!value && (this.ShowCellErrors || this.ShowCellToolTips))
                        {
                            // reset the tool tip 
                            this.toolTipControl.Activate(!String.IsNullOrEmpty(this.toolTipCaption));
                        } 
                    } 

                    if (!this.layout.dirty && !this.DesignMode) 
                    {
                        Invalidate(this.layout.RowHeaders);
                    }
                } 
            }
        } 
 
        internal bool SingleHorizontalBorderAdded
        { 
            get
            {
                return !this.layout.ColumnHeadersVisible &&
                    (this.AdvancedCellBorderStyle.All == DataGridViewAdvancedCellBorderStyle.Single || 
                     this.CellBorderStyle == DataGridViewCellBorderStyle.SingleHorizontal);
            } 
        } 

        internal bool SingleVerticalBorderAdded 
        {
            get
            {
                return !this.layout.RowHeadersVisible && 
                    (this.AdvancedCellBorderStyle.All == DataGridViewAdvancedCellBorderStyle.Single ||
                     this.CellBorderStyle == DataGridViewCellBorderStyle.SingleVertical); 
            } 
        }
 
        /// 
        [
            Browsable(false)
        ] 
        public DataGridViewColumn SortedColumn
        { 
            get 
            {
                return this.sortedColumn; 
            }
        }

        ///  
        [
            Browsable(false) 
        ] 
        public SortOrder SortOrder
        { 
            get
            {
                return this.sortOrder;
            } 
        }
 
        ///  
        /// 
        ///     
        ///    
        /// 
        [
            SRCategory(SR.CatBehavior), 
            DefaultValue(false),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            SRDescription(SR.DataGridView_StandardTabDescr) 
        ]
        public bool StandardTab 
        {
            get
            {
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_standardTab]; 
            }
            set 
            { 
                if (this.dataGridViewState1[DATAGRIDVIEWSTATE1_standardTab] != value)
                { 
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_standardTab] = value;
                    //OnStandardTabChanged(EventArgs.Empty);
                }
            } 
        }
 
        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Never),
            Bindable(false)
        ]
        public override string Text 
        {
            get 
            { 
                return base.Text;
            } 
            set
            {
                base.Text = value;
            } 
        }
 
        ///  
        [
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Never)
        ]
        new public event EventHandler TextChanged
        { 
            add
            { 
                base.TextChanged += value; 
            }
            remove 
            {
                base.TextChanged -= value;
            }
        } 

        ///  
        [ 
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
            SuppressMessage("Microsoft.Design", "CA1023:IndexersShouldNotBeMultidimensional")
        ]
        public DataGridViewCell this[int columnIndex, int rowIndex]
        { 
            get
            { 
                DataGridViewRow row = this.Rows[rowIndex]; 
                return row.Cells[columnIndex];
            } 
            set
            {
                DataGridViewRow row = this.Rows[rowIndex];
                row.Cells[columnIndex] = value; 
            }
        } 
 
        /// 
        [ 
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
            SuppressMessage("Microsoft.Design", "CA1023:IndexersShouldNotBeMultidimensional")
        ] 
        public DataGridViewCell this[string columnName, int rowIndex]
        { 
            get 
            {
                DataGridViewRow row = this.Rows[rowIndex]; 
                return row.Cells[columnName];
            }
            set
            { 
                DataGridViewRow row = this.Rows[rowIndex];
                row.Cells[columnName] = value; 
            } 
        }
 
        private string ToolTipPrivate
        {
            get
            { 
                return this.toolTipCaption;
            } 
        } 

        ///  
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public DataGridViewHeaderCell TopLeftHeaderCell
        { 
            get 
            {
                if (this.topLeftHeaderCell == null) 
                {
                    this.TopLeftHeaderCell = new DataGridViewTopLeftHeaderCell();
                }
                return this.topLeftHeaderCell; 
            }
            set 
            { 
                if (this.topLeftHeaderCell != value)
                { 
                    if (this.topLeftHeaderCell != null)
                    {
                        // Detach existing header cell
                        this.topLeftHeaderCell.DataGridViewInternal = null; 
                    }
                    this.topLeftHeaderCell = value; 
                    if (value != null) 
                    {
                        this.topLeftHeaderCell.DataGridViewInternal = this; 
                    }
                    if (this.ColumnHeadersVisible && this.RowHeadersVisible)
                    {
                        // If headers (rows or columns) are autosized, then this.RowHeadersWidth or this.ColumnHeadersHeight 
                        // must be updated based on new cell preferred size
                        OnColumnHeadersGlobalAutoSize(); 
                        // In all cases, the top left cell needs to repaint 
                        Invalidate(new Rectangle(this.layout.Inside.X, this.layout.Inside.Y, this.RowHeadersWidth, this.ColumnHeadersHeight));
                    } 
                }
            }
        }
 
        /// 
        [ 
            Browsable(false), 
            EditorBrowsable(EditorBrowsableState.Advanced)
        ] 
        public Cursor UserSetCursor
        {
            get
            { 
                if (this.dataGridViewState1[DATAGRIDVIEWSTATE1_customCursorSet])
                { 
                    return this.oldCursor; 
                }
                else 
                {
                    return this.Cursor;
                }
            } 
        }
 
        internal int VerticalOffset 
        {
            get 
            {
                return this.verticalOffset;
            }
            set 
            {
                if (value < 0) 
                { 
                    value = 0;
                } 
                int totalVisibleFrozenHeight = this.Rows.GetRowsHeight(DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen);
                int fittingTrailingScrollingRowsHeight = ComputeHeightOfFittingTrailingScrollingRows(totalVisibleFrozenHeight);
                if (value > this.vertScrollBar.Maximum - fittingTrailingScrollingRowsHeight)
                { 
                    value = this.vertScrollBar.Maximum - fittingTrailingScrollingRowsHeight;
                } 
                if (value == this.verticalOffset) 
                {
                    return; 
                }

                int change = value - this.verticalOffset;
                if (this.vertScrollBar.Enabled) 
                {
                    this.vertScrollBar.Value = value; 
                } 
                ScrollRowsByHeight(change); // calculate how many rows need to be scrolled based on 'change'
            } 
        }

        /// 
        protected ScrollBar VerticalScrollBar 
        {
            get 
            { 
                return this.vertScrollBar;
            } 
        }

        /// 
        [ 
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ] 
        public int VerticalScrollingOffset
        { 
            get
            {
                return this.verticalOffset;
            } 
        }
 
        private System.Windows.Forms.Timer VertScrollTimer 
        {
            get 
            {
                if (this.vertScrollTimer == null)
                {
                    this.vertScrollTimer = new System.Windows.Forms.Timer(); 
                    this.vertScrollTimer.Tick += new System.EventHandler(VertScrollTimer_Tick);
                } 
                return this.vertScrollTimer; 
            }
        } 

        /// 
        /// 
        ///     
        ///    
        ///  
        [ 
            SRCategory(SR.CatBehavior),
            DefaultValue(false), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridViewVirtualModeDescr)
        ]
        public bool VirtualMode 
        {
            get 
            { 
                return this.dataGridViewState1[DATAGRIDVIEWSTATE1_virtualMode];
            } 
            set
            {
                if (this.dataGridViewState1[DATAGRIDVIEWSTATE1_virtualMode] != value)
                { 
                    this.dataGridViewState1[DATAGRIDVIEWSTATE1_virtualMode] = value;
                    InvalidateRowHeights(); 
                    //OnVirtualModeChanged(EventArgs.Empty); 
                }
            } 
        }

        private bool VisibleCellExists
        { 
            get
            { 
                if (null == this.Columns.GetFirstColumn(DataGridViewElementStates.Visible)) 
                {
                    return false; 
                }
                return -1 != this.Rows.GetFirstRow(DataGridViewElementStates.Visible);
            }
        } 

        // Events start here 
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridViewAutoSizeColumnModeChangedDescr)
        ]
        public event DataGridViewAutoSizeColumnModeEventHandler AutoSizeColumnModeChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWAUTOSIZECOLUMNMODECHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWAUTOSIZECOLUMNMODECHANGED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_CancelRowEditDescr)
        ]
        public event QuestionEventHandler CancelRowEdit
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCANCELROWEDIT, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCANCELROWEDIT, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatData),
            SRDescription(SR.DataGridView_CellBeginEditDescr) 
        ]
        public event DataGridViewCellCancelEventHandler CellBeginEdit
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLBEGINEDIT, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLBEGINEDIT, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_CellClickDescr)
        ] 
        public event DataGridViewCellEventHandler CellClick
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLCLICK, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLCLICK, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_CellContentClick) 
        ]
        public event DataGridViewCellEventHandler CellContentClick 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLCONTENTCLICK, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLCONTENTCLICK, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_CellContentDoubleClick) 
        ] 
        public event DataGridViewCellEventHandler CellContentDoubleClick
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLCONTENTDOUBLECLICK, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLCONTENTDOUBLECLICK, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_CellContextMenuStripChanged),
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ] 
        public event DataGridViewCellEventHandler CellContextMenuStripChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLCONTEXTMENUSTRIPCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLCONTEXTMENUSTRIPCHANGED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_CellContextMenuStripNeeded),
            EditorBrowsable(EditorBrowsableState.Advanced) 
        ] 
        public event DataGridViewCellContextMenuStripNeededEventHandler CellContextMenuStripNeeded
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLCONTEXTMENUSTRIPNEEDED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLCONTEXTMENUSTRIPNEEDED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_CellDoubleClickDescr)
        ] 
        public event DataGridViewCellEventHandler CellDoubleClick 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLDOUBLECLICK, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLDOUBLECLICK, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatData),
            SRDescription(SR.DataGridView_CellEndEditDescr) 
        ]
        public event DataGridViewCellEventHandler CellEndEdit 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLENDEDIT, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLENDEDIT, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatFocus),
            SRDescription(SR.DataGridView_CellEnterDescr)
        ] 
        public event DataGridViewCellEventHandler CellEnter
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLENTER, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLENTER, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_CellErrorTextChangedDescr)
        ]
        public event DataGridViewCellEventHandler CellErrorTextChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLERRORTEXTCHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLERRORTEXTCHANGED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatData), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_CellErrorTextNeededDescr)
        ]
        public event DataGridViewCellErrorTextNeededEventHandler CellErrorTextNeeded 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLERRORTEXTNEEDED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLERRORTEXTNEEDED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatDisplay), 
            SRDescription(SR.DataGridView_CellFormattingDescr)
        ]
        public event DataGridViewCellFormattingEventHandler CellFormatting
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLFORMATTING, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLFORMATTING, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatFocus),
            SRDescription(SR.DataGridView_CellLeaveDescr) 
        ]
        public event DataGridViewCellEventHandler CellLeave
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLLEAVE, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLLEAVE, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_CellMouseClickDescr)
        ] 
        public event DataGridViewCellMouseEventHandler CellMouseClick
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSECLICK, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSECLICK, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_CellMouseDoubleClickDescr) 
        ]
        public event DataGridViewCellMouseEventHandler CellMouseDoubleClick 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSEDOUBLECLICK, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSEDOUBLECLICK, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_CellMouseDownDescr) 
        ] 
        public event DataGridViewCellMouseEventHandler CellMouseDown
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSEDOWN, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSEDOWN, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_CellMouseEnterDescr)
        ] 
        public event DataGridViewCellEventHandler CellMouseEnter 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSEENTER, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSEENTER, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_CellMouseLeaveDescr) 
        ]
        public event DataGridViewCellEventHandler CellMouseLeave 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSELEAVE, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSELEAVE, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_CellMouseMoveDescr)
        ] 
        public event DataGridViewCellMouseEventHandler CellMouseMove
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSEMOVE, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSEMOVE, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_CellMouseUpDescr)
        ]
        public event DataGridViewCellMouseEventHandler CellMouseUp 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLMOUSEUP, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLMOUSEUP, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatDisplay), 
            SRDescription(SR.DataGridView_CellPaintingDescr)
        ]
        public event DataGridViewCellPaintingEventHandler CellPainting
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLPAINTING, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLPAINTING, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatDisplay),
            SRDescription(SR.DataGridView_CellParsingDescr) 
        ]
        public event DataGridViewCellParsingEventHandler CellParsing
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLPARSING, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLPARSING, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_CellStateChangedDescr)
        ] 
        public event DataGridViewCellStateChangedEventHandler CellStateChanged
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLSTATECHANGED, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLSTATECHANGED, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_CellStyleChangedDescr) 
        ]
        public event DataGridViewCellEventHandler CellStyleChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLSTYLECHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLSTYLECHANGED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_CellStyleContentChangedDescr) 
        ] 
        public event DataGridViewCellStyleContentChangedEventHandler CellStyleContentChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLSTYLECONTENTCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLSTYLECONTENTCHANGED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_CellToolTipTextChangedDescr)
        ] 
        public event DataGridViewCellEventHandler CellToolTipTextChanged 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLTOOLTIPTEXTCHANGED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLTOOLTIPTEXTCHANGED, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_CellToolTipTextNeededDescr), 
            EditorBrowsable(EditorBrowsableState.Advanced)
        ] 
        public event DataGridViewCellToolTipTextNeededEventHandler CellToolTipTextNeeded 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLTOOLTIPTEXTNEEDED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLTOOLTIPTEXTNEEDED, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatFocus),
            SRDescription(SR.DataGridView_CellValidatedDescr) 
        ]
        public event DataGridViewCellEventHandler CellValidated 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLVALIDATED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLVALIDATED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatFocus),
            SRDescription(SR.DataGridView_CellValidatingDescr)
        ] 
        public event DataGridViewCellValidatingEventHandler CellValidating
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLVALIDATING, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLVALIDATING, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatAction),
            SRDescription(SR.DataGridView_CellValueChangedDescr)
        ]
        public event DataGridViewCellEventHandler CellValueChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLVALUECHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLVALUECHANGED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatData), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_CellValueNeededDescr)
        ]
        public event DataGridViewCellValueEventHandler CellValueNeeded 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLVALUENEEDED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLVALUENEEDED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatData), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_CellValuePushedDescr)
        ]
        public event DataGridViewCellValueEventHandler CellValuePushed 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCELLVALUEPUSHED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCELLVALUEPUSHED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_ColumnAddedDescr)
        ]
        public event DataGridViewColumnEventHandler ColumnAdded
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNADDED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNADDED, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnContextMenuStripChangedDescr) 
        ]
        public event DataGridViewColumnEventHandler ColumnContextMenuStripChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNCONTEXTMENUSTRIPCHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNCONTEXTMENUSTRIPCHANGED, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_ColumnDataPropertyNameChangedDescr)
        ] 
        public event DataGridViewColumnEventHandler ColumnDataPropertyNameChanged
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNDATAPROPERTYNAMECHANGED, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNDATAPROPERTYNAMECHANGED, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_ColumnDefaultCellStyleChangedDescr) 
        ]
        public event DataGridViewColumnEventHandler ColumnDefaultCellStyleChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNDEFAULTCELLSTYLECHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNDEFAULTCELLSTYLECHANGED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnDisplayIndexChangedDescr) 
        ] 
        public event DataGridViewColumnEventHandler ColumnDisplayIndexChanged
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNDISPLAYINDEXCHANGED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNDISPLAYINDEXCHANGED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_ColumnDividerDoubleClickDescr)
        ] 
        public event DataGridViewColumnDividerDoubleClickEventHandler ColumnDividerDoubleClick 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNDIVIDERDOUBLECLICK, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNDIVIDERDOUBLECLICK, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnDividerWidthChangedDescr) 
        ]
        public event DataGridViewColumnEventHandler ColumnDividerWidthChanged 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNDIVIDERWIDTHCHANGED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNDIVIDERWIDTHCHANGED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_ColumnHeaderMouseClickDescr)
        ] 
        public event DataGridViewCellMouseEventHandler ColumnHeaderMouseClick
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERMOUSECLICK, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERMOUSECLICK, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_ColumnHeaderMouseDoubleClickDescr)
        ]
        public event DataGridViewCellMouseEventHandler ColumnHeaderMouseDoubleClick 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERMOUSEDOUBLECLICK, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERMOUSEDOUBLECLICK, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_ColumnHeaderCellChangedDescr)
        ]
        public event DataGridViewColumnEventHandler ColumnHeaderCellChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERCELLCHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNHEADERCELLCHANGED, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnMinimumWidthChangedDescr) 
        ]
        public event DataGridViewColumnEventHandler ColumnMinimumWidthChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNMINIMUMWIDTHCHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNMINIMUMWIDTHCHANGED, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_ColumnNameChangedDescr)
        ] 
        public event DataGridViewColumnEventHandler ColumnNameChanged
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNNAMECHANGED, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNNAMECHANGED, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_ColumnRemovedDescr) 
        ]
        public event DataGridViewColumnEventHandler ColumnRemoved 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNREMOVED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNREMOVED, value);
            } 
        }

        /*/// 
        ///  
        public event EventHandler ColumnsDefaultCellStyleChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNSDEFAULTCELLSTYLECHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNSDEFAULTCELLSTYLECHANGED, value); 
            }
        }*/ 
 
        /// 
        [ 
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridViewColumnSortModeChangedDescr)
        ]
        public event DataGridViewColumnEventHandler ColumnSortModeChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNSORTMODECHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNSORTMODECHANGED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_ColumnStateChangedDescr)
        ]
        public event DataGridViewColumnStateChangedEventHandler ColumnStateChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNSTATECHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNSTATECHANGED, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_ColumnToolTipTextChangedDescr) 
        ]
        public event DataGridViewColumnEventHandler ColumnToolTipTextChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNTOOLTIPTEXTCHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNTOOLTIPTEXTCHANGED, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_ColumnWidthChangedDescr)
        ] 
        public event DataGridViewColumnEventHandler ColumnWidthChanged
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCOLUMNWIDTHCHANGED, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCOLUMNWIDTHCHANGED, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_CurrentCellChangedDescr) 
        ]
        public event EventHandler CurrentCellChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCURRENTCELLCHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCURRENTCELLCHANGED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatBehavior),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            SRDescription(SR.DataGridView_CurrentCellDirtyStateChangedDescr) 
        ]
        public event EventHandler CurrentCellDirtyStateChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWCURRENTCELLDIRTYSTATECHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWCURRENTCELLDIRTYSTATECHANGED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatData),
            SRDescription(SR.DataGridView_DataBindingCompleteDescr) 
        ] 
        public event DataGridViewBindingCompleteEventHandler DataBindingComplete
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWDATABINDINGCOMPLETE, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWDATABINDINGCOMPLETE, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_DataErrorDescr)
        ] 
        public event DataGridViewDataErrorEventHandler DataError 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWDATAERROR, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWDATAERROR, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatData),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            SRDescription(SR.DataGridView_DefaultValuesNeededDescr)
        ] 
        public event DataGridViewRowEventHandler DefaultValuesNeeded 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWDEFAULTVALUESNEEDED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWDEFAULTVALUESNEEDED, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatAction),
            SRDescription(SR.DataGridView_EditingControlShowingDescr) 
        ]
        public event DataGridViewEditingControlShowingEventHandler EditingControlShowing 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWEDITINGCONTROLSHOWING, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWEDITINGCONTROLSHOWING, value);
            } 
        } 

        /* 
        /// 
        public event QuestionEventHandler KeepNewRow
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWKEEPNEWROW, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWKEEPNEWROW, value);
            }
        }*/
 
        /*/// 
        ///  
        public event EventHandler NewRowDiscarded 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWNEWROWDISCARDED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWNEWROWDISCARDED, value); 
            } 
        }*/
 
        /// 
        [
            SRCategory(SR.CatData),
            SRDescription(SR.DataGridView_NewRowNeededDescr) 
        ]
        public event DataGridViewRowEventHandler NewRowNeeded 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWNEWROWNEEDED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWNEWROWNEEDED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_RowContextMenuStripChangedDescr)
        ] 
        public event DataGridViewRowEventHandler RowContextMenuStripChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWCONTEXTMENUSTRIPCHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWCONTEXTMENUSTRIPCHANGED, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatData),
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_RowContextMenuStripNeededDescr)
        ] 
        public event DataGridViewRowContextMenuStripNeededEventHandler RowContextMenuStripNeeded
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWCONTEXTMENUSTRIPNEEDED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWCONTEXTMENUSTRIPNEEDED, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_RowDefaultCellStyleChangedDescr)
        ]
        public event DataGridViewRowEventHandler RowDefaultCellStyleChanged 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWDEFAULTCELLSTYLECHANGED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWDEFAULTCELLSTYLECHANGED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatData), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_RowDirtyStateNeededDescr)
        ]
        public event QuestionEventHandler RowDirtyStateNeeded 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWDIRTYSTATENEEDED, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWDIRTYSTATENEEDED, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_RowDividerDoubleClickDescr)
        ]
        public event DataGridViewRowDividerDoubleClickEventHandler RowDividerDoubleClick
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWDIVIDERDOUBLECLICK, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWDIVIDERDOUBLECLICK, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_RowDividerHeightChangedDescr) 
        ]
        public event DataGridViewRowEventHandler RowDividerHeightChanged
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWDIVIDERHEIGHTCHANGED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWDIVIDERHEIGHTCHANGED, value);
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatFocus), 
            SRDescription(SR.DataGridView_RowEnterDescr)
        ] 
        public event DataGridViewCellEventHandler RowEnter
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWENTER, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWENTER, value); 
            }
        }

        ///  
        [
            SRCategory(SR.CatPropertyChanged), 
            SRDescription(SR.DataGridView_RowErrorTextChangedDescr) 
        ]
        public event DataGridViewRowEventHandler RowErrorTextChanged 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWERRORTEXTCHANGED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWERRORTEXTCHANGED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatData),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            SRDescription(SR.DataGridView_RowErrorTextNeededDescr) 
        ]
        public event DataGridViewRowErrorTextNeededEventHandler RowErrorTextNeeded 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWERRORTEXTNEEDED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWERRORTEXTNEEDED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatMouse),
            SRDescription(SR.DataGridView_RowHeaderMouseClickDescr) 
        ] 
        public event DataGridViewCellMouseEventHandler RowHeaderMouseClick
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERMOUSECLICK, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERMOUSECLICK, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatMouse), 
            SRDescription(SR.DataGridView_RowHeaderMouseDoubleClickDescr)
        ] 
        public event DataGridViewCellMouseEventHandler RowHeaderMouseDoubleClick 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERMOUSEDOUBLECLICK, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERMOUSEDOUBLECLICK, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_RowHeaderCellChangedDescr) 
        ]
        public event DataGridViewRowEventHandler RowHeaderCellChanged 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEADERCELLCHANGED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEADERCELLCHANGED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_RowHeightChangedDescr)
        ] 
        public event DataGridViewRowEventHandler RowHeightChanged
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEIGHTCHANGED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEIGHTCHANGED, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatData),
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_RowHeightInfoNeededDescr)
        ] 
        public event DataGridViewRowHeightInfoNeededEventHandler RowHeightInfoNeeded
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEIGHTINFONEEDED, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEIGHTINFONEEDED, value); 
            }
        } 
 
        internal DataGridViewRowHeightInfoNeededEventArgs RowHeightInfoNeededEventArgs
        { 
            get
            {
                if (this.dgvrhine == null)
                { 
                    this.dgvrhine = new DataGridViewRowHeightInfoNeededEventArgs();
                } 
                return this.dgvrhine; 
            }
        } 

        /// 
        [
            SRCategory(SR.CatData), 
            EditorBrowsable(EditorBrowsableState.Advanced),
            SRDescription(SR.DataGridView_RowHeightInfoPushedDescr) 
        ] 
        public event DataGridViewRowHeightInfoPushedEventHandler RowHeightInfoPushed
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWHEIGHTINFOPUSHED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWHEIGHTINFOPUSHED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatFocus), 
            SRDescription(SR.DataGridView_RowLeaveDescr)
        ] 
        public event DataGridViewCellEventHandler RowLeave 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWLEAVE, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWLEAVE, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatPropertyChanged),
            SRDescription(SR.DataGridView_RowMinimumHeightChangedDescr) 
        ]
        public event DataGridViewRowEventHandler RowMinimumHeightChanged 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWMINIMUMHEIGHTCHANGED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWMINIMUMHEIGHTCHANGED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatDisplay),
            SRDescription(SR.DataGridView_RowPostPaintDescr)
        ] 
        public event DataGridViewRowPostPaintEventHandler RowPostPaint
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWPOSTPAINT, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWPOSTPAINT, value); 
            }
        } 
 
        internal DataGridViewRowPostPaintEventArgs RowPostPaintEventArgs
        { 
            get
            {
                if (this.dgvrpope == null)
                { 
                    this.dgvrpope = new DataGridViewRowPostPaintEventArgs(this);
                } 
                return this.dgvrpope; 
            }
        } 

        /// 
        [
            SRCategory(SR.CatDisplay), 
            SRDescription(SR.DataGridView_RowPrePaintDescr)
        ] 
        public event DataGridViewRowPrePaintEventHandler RowPrePaint 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWPREPAINT, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWPREPAINT, value); 
            } 
        }
 
        internal DataGridViewRowPrePaintEventArgs RowPrePaintEventArgs
        {
            get
            { 
                if (this.dgvrprpe == null)
                { 
                    this.dgvrprpe = new DataGridViewRowPrePaintEventArgs(this); 
                }
                return this.dgvrprpe; 
            }
        }

        ///  
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_RowsAddedDescr) 
        ]
        public event DataGridViewRowsAddedEventHandler RowsAdded 
        {
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWSADDED, value); 
            }
            remove 
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWSADDED, value);
            } 
        }

        /// 
        [ 
            SRCategory(SR.CatAction),
            SRDescription(SR.DataGridView_RowsRemovedDescr) 
        ] 
        public event DataGridViewRowsRemovedEventHandler RowsRemoved
        { 
            add
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWSREMOVED, value);
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWSREMOVED, value); 
            }
        } 

        /// 
        [
            SRCategory(SR.CatBehavior), 
            SRDescription(SR.DataGridView_RowStateChangedDescr)
        ] 
        public event DataGridViewRowStateChangedEventHandler RowStateChanged 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWSTATECHANGED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWSTATECHANGED, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatBehavior),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            SRDescription(SR.DataGridView_RowUnsharedDescr)
        ] 
        public event DataGridViewRowEventHandler RowUnshared 
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWUNSHARED, value);
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWUNSHARED, value); 
            } 
        }
 
        /// 
        [
            SRCategory(SR.CatFocus),
            SRDescription(SR.DataGridView_RowValidatedDescr) 
        ]
        public event DataGridViewCellEventHandler RowValidated 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWVALIDATED, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWVALIDATED, value);
            } 
        } 

        ///  
        [
            SRCategory(SR.CatFocus),
            SRDescription(SR.DataGridView_RowValidatingDescr)
        ] 
        public event DataGridViewCellCancelEventHandler RowValidating
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWROWVALIDATING, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWROWVALIDATING, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatAction),
            SRDescription(SR.DataGridView_ScrollDescr)
        ]
        public event ScrollEventHandler Scroll 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWSCROLL, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWSCROLL, value);
            } 
        }
 
        ///  
        [
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_SelectionChangedDescr)
        ]
        public event EventHandler SelectionChanged
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWSELECTIONCHANGED, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWSELECTIONCHANGED, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatData),
            EditorBrowsable(EditorBrowsableState.Advanced), 
            SRDescription(SR.DataGridView_SortCompareDescr)
        ]
        public event DataGridViewSortCompareEventHandler SortCompare
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWSORTCOMPARE, value); 
            }
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWSORTCOMPARE, value);
            }
        } 

        ///  
        [ 
            SRCategory(SR.CatData),
            SRDescription(SR.DataGridView_SortedDescr) 
        ]
        public event EventHandler Sorted
        {
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWSORTED, value); 
            } 
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWSORTED, value);
            }
        }
 
        /// 
        ///  
        [ 
            Browsable(false),
            EditorBrowsable(EditorBrowsableState.Never) 
        ]
        new public event EventHandler StyleChanged
        {
            add 
            {
                base.StyleChanged += value; 
            } 
            remove
            { 
                base.StyleChanged -= value;
            }
        }
 
        /// 
        [ 
            SRCategory(SR.CatAction), 
            SRDescription(SR.DataGridView_UserAddedRowDescr)
        ] 
        public event DataGridViewRowEventHandler UserAddedRow
        {
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWUSERADDEDROW, value);
            } 
            remove 
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWUSERADDEDROW, value); 
            }
        }

        /*///  
        /// 
        public event DataGridViewRowCancelEventHandler UserAddingRow 
        { 
            add
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWUSERADDINGROW, value);
            }
            remove
            { 
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWUSERADDINGROW, value);
            } 
        }*/ 

        ///  
        [
            SRCategory(SR.CatAction),
            SRDescription(SR.DataGridView_UserDeletedRowDescr)
        ] 
        public event DataGridViewRowEventHandler UserDeletedRow
        { 
            add 
            {
                this.Events.AddHandler(EVENT_DATAGRIDVIEWUSERDELETEDROW, value); 
            }
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWUSERDELETEDROW, value); 
            }
        } 
 
        /// 
        [ 
            SRCategory(SR.CatAction),
            SRDescription(SR.DataGridView_UserDeletingRowDescr)
        ]
        public event DataGridViewRowCancelEventHandler UserDeletingRow 
        {
            add 
            { 
                this.Events.AddHandler(EVENT_DATAGRIDVIEWUSERDELETINGROW, value);
            } 
            remove
            {
                this.Events.RemoveHandler(EVENT_DATAGRIDVIEWUSERDELETINGROW, value);
            } 
        }
 
        //////////////////////// 
        //                    //
        // ISupportInitialize // 
        //                    //
        ////////////////////////
        [
            SuppressMessage("Microsoft.Design", "CA1033:InterfaceMethodsShouldBeCallableByChildTypes") // VSWhidbey 405004 
        ]
        void ISupportInitialize.BeginInit() 
        { 
            if (this.dataGridViewState2[DATAGRIDVIEWSTATE2_initializing])
            { 
                throw new InvalidOperationException(SR.GetString(SR.DataGridViewBeginInit));
            }

            this.dataGridViewState2[DATAGRIDVIEWSTATE2_initializing] = true; 
        }
 
        [ 
            SuppressMessage("Microsoft.Design", "CA1033:InterfaceMethodsShouldBeCallableByChildTypes") // VSWhidbey 405004
        ] 
        void ISupportInitialize.EndInit()
        {
            this.dataGridViewState2[DATAGRIDVIEWSTATE2_initializing] = false;
 
            foreach (DataGridViewColumn dataGridViewColumn in this.Columns)
            { 
                if (dataGridViewColumn.Frozen && 
                    dataGridViewColumn.Visible &&
                    dataGridViewColumn.InheritedAutoSizeMode == DataGridViewAutoSizeColumnMode.Fill) 
                {
                    dataGridViewColumn.AutoSizeMode = DataGridViewAutoSizeColumnMode.None;
                }
            } 

            DataGridViewSelectionMode selectionMode = this.SelectionMode; 
            if (selectionMode == DataGridViewSelectionMode.FullColumnSelect || selectionMode == DataGridViewSelectionMode.ColumnHeaderSelect) 
            {
                foreach (DataGridViewColumn dataGridViewColumn in this.Columns) 
                {
                    if (dataGridViewColumn.SortMode == DataGridViewColumnSortMode.Automatic)
                    {
                        // Resetting SelectionMode to its acceptable default value. We don't want the control to ever end up in an invalid state. 
                        this.SelectionMode = defaultSelectionMode; // DataGridViewSelectionMode.RowHeaderSelect
                        throw new InvalidOperationException(SR.GetString(SR.DataGridView_SelectionModeReset, 
                                                                         SR.GetString(SR.DataGridView_SelectionModeAndSortModeClash, (selectionMode).ToString()), 
                                                                         (defaultSelectionMode).ToString()));
                    } 
                }
            }
        }
 
        /* INTERNAL ENUMERATIONS */
 
        internal enum DataGridViewHitTestTypeInternal 
        {
            None, 
            Cell,
            ColumnHeader,
            RowHeader,
            ColumnResizeLeft, 
            ColumnResizeRight,
            RowResizeTop, 
            RowResizeBottom, 
            FirstColumnHeaderLeft,
            TopLeftHeader, 
            TopLeftHeaderResizeLeft,
            TopLeftHeaderResizeRight,
            TopLeftHeaderResizeTop,
            TopLeftHeaderResizeBottom, 
            ColumnHeadersResizeBottom,
            ColumnHeadersResizeTop, 
            RowHeadersResizeRight, 
            RowHeadersResizeLeft,
            ColumnHeaderLeft, 
            ColumnHeaderRight
        }

        internal enum DataGridViewValidateCellInternal 
        {
            Never, 
            Always, 
            WhenChanged
        } 

        private enum DataGridViewMouseEvent
        {
            Click, 
            DoubleClick,
            MouseClick, 
            MouseDoubleClick, 
            MouseDown,
            MouseUp, 
            MouseMove
        }

        private struct MouseClickInfo 
        {
            public MouseButtons button; 
            public long timeStamp; 
            public int x;
            public int y; 
            public int col;
            public int row;
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

                        

                        

                        
                        

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• ScriptServiceAttribute.cs
• EmptyQuery.cs
• IndicShape.cs
• XpsFontSubsetter.cs
• EntityDataSourceDataSelection.cs
• TaiwanCalendar.cs
• EpmTargetTree.cs
• Binding.cs
• SqlDataSourceCommandEventArgs.cs
• MouseDevice.cs
• CompiledQueryCacheEntry.cs
• ConstraintConverter.cs
• LinkClickEvent.cs
• CellParagraph.cs
• GlyphRun.cs
• RegularExpressionValidator.cs
• DataGridViewDataErrorEventArgs.cs
• RandomNumberGenerator.cs
• MediaElement.cs
• CollectionType.cs
• ToolStripItemRenderEventArgs.cs
• VersionedStream.cs
• DesignerTransactionCloseEvent.cs
• ClientApiGenerator.cs
• AnnotationHighlightLayer.cs
• SchemaMapping.cs
• PerformanceCounterPermissionEntryCollection.cs
• FontUnit.cs
• Model3DCollection.cs
• PeerNearMe.cs
• RuntimeConfigurationRecord.cs
• Line.cs
• BamlTreeNode.cs
• HttpServerVarsCollection.cs
• SemaphoreFullException.cs
• RNGCryptoServiceProvider.cs
• RequiredAttributeAttribute.cs
• Utility.cs
• RenderCapability.cs
• ParameterExpression.cs
• ApplicationSecurityInfo.cs
• SAPICategories.cs
• NeutralResourcesLanguageAttribute.cs
• PolyLineSegment.cs
• OpCodes.cs
• AdornerPresentationContext.cs
• InvalidCommandTreeException.cs
• ReflectionServiceProvider.cs
• GACIdentityPermission.cs
• BamlResourceDeserializer.cs
• HashSetEqualityComparer.cs
• DataGridItemCollection.cs
• InheritanceContextHelper.cs
• LinkedDataMemberFieldEditor.cs
• CodeIdentifier.cs
• PrintPreviewDialog.cs
• Selection.cs
• TextEditorSelection.cs
• RoleManagerEventArgs.cs
• ConfigUtil.cs
• NotFiniteNumberException.cs
• RotateTransform.cs
• MultiTrigger.cs
• ValidationEventArgs.cs
• KnownTypesProvider.cs
• OleDbConnectionPoolGroupProviderInfo.cs
• SchemaTypeEmitter.cs
• IdentityHolder.cs
• Int16Converter.cs
• ProxyGenerationError.cs
• AspNetHostingPermission.cs
• HttpListenerRequest.cs
• CasesDictionary.cs
• HttpListenerPrefixCollection.cs
• HtmlControlDesigner.cs
• PixelFormat.cs
• ConstNode.cs
• DataColumnSelectionConverter.cs
• TextModifier.cs
• ComponentManagerBroker.cs
• WindowsFormsHelpers.cs
• Int32CollectionValueSerializer.cs
• XmlDictionary.cs
• RectangleHotSpot.cs
• CardSpaceSelector.cs
• ToolStripComboBox.cs
• NamedPipeProcessProtocolHandler.cs
• Win32.cs
• SubstitutionList.cs
• SmtpNegotiateAuthenticationModule.cs
• MDIWindowDialog.cs
• MsmqVerifier.cs
• VectorCollectionConverter.cs
• NonNullItemCollection.cs
• ReplacementText.cs
• DataGridColumnEventArgs.cs
• XmlElement.cs
• FunctionNode.cs
• ModelItemImpl.cs
• DataGridViewCellStyleBuilderDialog.cs