DetailsView.cs source code in C# .NET

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Code:

/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / DetailsView.cs / 4 / DetailsView.cs

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

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections; 
    using System.Collections.Specialized;
    using System.ComponentModel;
    using System.ComponentModel.Design;
    using System.Drawing.Design; 
    using System.Globalization;
    using System.IO; 
    using System.Reflection; 
    using System.Security.Permissions;
    using System.Text; 
    using System.Web.UI.Adapters;
    using System.Web.Util;
    using System.Web.UI.WebControls.Adapters;
 
    /// 
    ///     
    ///       Displays a data record from a data source in a table layout. The data source 
    ///       is any object that implements IEnumerable or IListSource, which includes ADO.NET data,
    ///       arrays, ArrayLists, DataSourceControl, etc. 
    ///    
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [
    Designer("System.Web.UI.Design.WebControls.DetailsViewDesigner, " + AssemblyRef.SystemDesign), 
    ControlValueProperty("SelectedValue"), 
    DefaultEvent("PageIndexChanging"),
    ToolboxData("<{0}:DetailsView runat=\"server\" Width=\"125px\" Height=\"50px\">"), 
    SupportsEventValidation
    ]

    public class DetailsView : CompositeDataBoundControl, IDataItemContainer, ICallbackContainer, ICallbackEventHandler, IPostBackEventHandler, IPostBackContainer { 
        private static readonly object EventItemCommand = new object();
        private static readonly object EventItemCreated = new object(); 
        private static readonly object EventItemDeleted = new object(); 
        private static readonly object EventItemDeleting = new object();
        private static readonly object EventItemInserting = new object(); 
        private static readonly object EventItemInserted = new object();
        private static readonly object EventItemUpdating = new object();
        private static readonly object EventItemUpdated = new object();
        private static readonly object EventModeChanged = new object(); 
        private static readonly object EventModeChanging = new object();
        private static readonly object EventPageIndexChanged = new object(); 
        private static readonly object EventPageIndexChanging = new object(); 

        private ITemplate _headerTemplate; 
        private ITemplate _footerTemplate;
        private ITemplate _pagerTemplate;
        private ITemplate _emptyDataTemplate;
 
        private TableItemStyle _rowStyle;
        private TableItemStyle _headerStyle; 
        private TableItemStyle _footerStyle; 
        private TableItemStyle _editRowStyle;
        private TableItemStyle _alternatingRowStyle; 
        private TableItemStyle _commandRowStyle;
        private TableItemStyle _insertRowStyle;
        private TableItemStyle _emptyDataRowStyle;
        private TableItemStyle _fieldHeaderStyle; 

        private DetailsViewRow _bottomPagerRow; 
        private DetailsViewRow _footerRow; 
        private DetailsViewRow _headerRow;
        private DetailsViewRow _topPagerRow; 

        private TableItemStyle _pagerStyle;
        private PagerSettings _pagerSettings;
 
        private ArrayList _rowsArray;
        private ArrayList _autoGenFieldProps; 
        private DataControlFieldCollection _fieldCollection; 
        private DetailsViewRowCollection _rowsCollection;
        private int _pageCount; 
        private object _dataItem;
        private int _dataItemIndex;
        private OrderedDictionary _boundFieldValues;
        private DataKey _dataKey; 
        private OrderedDictionary _keyTable;
        private string[] _dataKeyNames; 
 
        private int _pageIndex;
        private DetailsViewMode _defaultMode = DetailsViewMode.ReadOnly; 
        private DetailsViewMode _mode;
        private bool _modeSet;
        private bool _useServerPaging;
 
        private bool _renderClientScript;
        private bool _renderClientScriptValid = false; 
 
        private IOrderedDictionary _deleteKeys;
        private IOrderedDictionary _deleteValues; 
        private IOrderedDictionary _insertValues;
        private IOrderedDictionary _updateKeys;
        private IOrderedDictionary _updateOldValues;
        private IOrderedDictionary _updateNewValues; 

 
 
        /// 
        /// Gets or sets a value that indicates whether paging is allowed. 
        /// 
        [
        WebCategory("Paging"),
        DefaultValue(false), 
        WebSysDescription(SR.DetailsView_AllowPaging)
        ] 
        public virtual bool AllowPaging { 
            get {
                object o = ViewState["AllowPaging"]; 
                if (o != null)
                    return(bool)o;
                return false;
            } 
            set {
                bool oldValue = AllowPaging; 
                if (value != oldValue) { 
                    ViewState["AllowPaging"] = value;
                    if (Initialized) { 
                        RequiresDataBinding = true;
                    }
                }
            } 
        }
 
 
        /// 
        /// Indicates the style properties of alternating rows. 
        /// 
        [
        WebCategory("Styles"),
        DefaultValue(null), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
        NotifyParentProperty(true), 
        PersistenceMode(PersistenceMode.InnerProperty), 
        WebSysDescription(SR.DetailsView_AlternatingRowStyle)
        ] 
        public TableItemStyle AlternatingRowStyle {
            get {
                if (_alternatingRowStyle == null) {
                    _alternatingRowStyle = new TableItemStyle(); 
                    if (IsTrackingViewState)
                        ((IStateManager)_alternatingRowStyle).TrackViewState(); 
                } 
                return _alternatingRowStyle;
            } 
        }


        ///  
        /// Gets or sets a value that indicates whether a button field for deleting will automatically
        /// be created. 
        ///  
        [
        WebCategory("Behavior"), 
        DefaultValue(false),
        WebSysDescription(SR.DetailsView_AutoGenerateDeleteButton)
        ]
        public virtual bool AutoGenerateDeleteButton { 
            get {
                object o = ViewState["AutoGenerateDeleteButton"]; 
                if (o != null) 
                    return(bool)o;
                return false; 
            }
            set {
                bool oldValue = AutoGenerateDeleteButton;
                if (value != oldValue) { 
                    ViewState["AutoGenerateDeleteButton"] = value;
                    if (Initialized) { 
                        RequiresDataBinding = true; 
                    }
                } 
            }
        }

 
        /// 
        /// Gets or sets a value that indicates whether an edit field will automatically 
        /// be created. 
        /// 
        [ 
        WebCategory("Behavior"),
        DefaultValue(false),
        WebSysDescription(SR.DetailsView_AutoGenerateEditButton)
        ] 
        public virtual bool AutoGenerateEditButton {
            get { 
                object o = ViewState["AutoGenerateEditButton"]; 
                if (o != null)
                    return(bool)o; 
                return false;
            }
            set {
                bool oldValue = AutoGenerateEditButton; 
                if (value != oldValue) {
                    ViewState["AutoGenerateEditButton"] = value; 
                    if (Initialized) { 
                        RequiresDataBinding = true;
                    } 
                }
            }
        }
 

        ///  
        /// Gets or sets a value that indicates whether an insert field will automatically 
        /// be created.
        ///  
        [
        WebCategory("Behavior"),
        DefaultValue(false),
        WebSysDescription(SR.DetailsView_AutoGenerateInsertButton) 
        ]
        public virtual bool AutoGenerateInsertButton { 
            get { 
                object o = ViewState["AutoGenerateInsertButton"];
                if (o != null) 
                    return(bool)o;
                return false;
            }
            set { 
                bool oldValue = AutoGenerateInsertButton;
                if (value != oldValue) { 
                    ViewState["AutoGenerateInsertButton"] = value; 
                    if (Initialized) {
                        RequiresDataBinding = true; 
                    }
                }
            }
        } 

 
        ///  
        /// Gets or sets a value that indicates whether fields will automatically
        /// be created for each bound data field. 
        /// 
        [
        WebCategory("Behavior"),
        DefaultValue(true), 
        WebSysDescription(SR.DetailsView_AutoGenerateRows)
        ] 
        public virtual bool AutoGenerateRows { 
            get {
                object o = ViewState["AutoGenerateRows"]; 
                if (o != null)
                    return(bool)o;
                return true;
            } 
            set {
                bool oldValue = AutoGenerateRows; 
                if (value != oldValue) { 
                    ViewState["AutoGenerateRows"] = value;
                    if (Initialized) { 
                        RequiresDataBinding = true;
                    }
                }
            } 
        }
 
 
        /// 
        /// Gets or sets the URL of an image to display in the 
        /// background of the .
        /// 
        [
        WebCategory("Appearance"), 
        DefaultValue(""),
        Editor("System.Web.UI.Design.ImageUrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), 
        UrlProperty(), 
        WebSysDescription(SR.WebControl_BackImageUrl)
        ] 
        public virtual string BackImageUrl {
            get {
                if (ControlStyleCreated == false) {
                    return String.Empty; 
                }
                return((TableStyle)ControlStyle).BackImageUrl; 
            } 
            set {
                ((TableStyle)ControlStyle).BackImageUrl = value; 
            }
        }

 
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        ]
        public virtual DetailsViewRow BottomPagerRow { 
            get {
                if (_bottomPagerRow == null) {
                    EnsureChildControls();
                } 
                return _bottomPagerRow;
            } 
        } 

        private IOrderedDictionary BoundFieldValues { 
            get {
                if (_boundFieldValues == null) {
                    int capacity = Fields.Count;
                    if (AutoGenerateRows) { 
                        capacity += 10;
                    } 
                    _boundFieldValues = new OrderedDictionary(capacity); 
                }
                return _boundFieldValues; 
            }
        }

 
        [
        Localizable(true), 
        DefaultValue(""), 
        WebCategory("Accessibility"),
        WebSysDescription(SR.DataControls_Caption) 
        ]
        public virtual string Caption {
            get {
                string s = (string)ViewState["Caption"]; 
                return (s != null) ? s : String.Empty;
            } 
            set { 
                ViewState["Caption"] = value;
            } 
        }


        [ 
        DefaultValue(TableCaptionAlign.NotSet),
        WebCategory("Accessibility"), 
        WebSysDescription(SR.WebControl_CaptionAlign) 
        ]
        public virtual TableCaptionAlign CaptionAlign { 
            get {
                object o = ViewState["CaptionAlign"];
                return (o != null) ? (TableCaptionAlign)o : TableCaptionAlign.NotSet;
            } 
            set {
                if ((value < TableCaptionAlign.NotSet) || 
                    (value > TableCaptionAlign.Right)) { 
                    throw new ArgumentOutOfRangeException("value");
                } 
                ViewState["CaptionAlign"] = value;
            }
        }
 

 
        ///  
        /// Indicates the amount of space between cells.
        ///  
        [
        WebCategory("Layout"),
        DefaultValue(-1),
        WebSysDescription(SR.DetailsView_CellPadding) 
        ]
        public virtual int CellPadding { 
            get { 
                if (ControlStyleCreated == false) {
                    return -1; 
                }
                return((TableStyle)ControlStyle).CellPadding;
            }
            set { 
                ((TableStyle)ControlStyle).CellPadding = value;
            } 
        } 

 
        /// 
        /// Gets or sets the amount of space between the contents of
        /// a cell and the cell's border.
        ///  
        [
        WebCategory("Layout"), 
        DefaultValue(0), 
        WebSysDescription(SR.DetailsView_CellSpacing)
        ] 
        public virtual int CellSpacing {
            get {
                if (ControlStyleCreated == false) {
                    return 0; 
                }
                return((TableStyle)ControlStyle).CellSpacing; 
            } 
            set {
                ((TableStyle)ControlStyle).CellSpacing = value; 
            }
        }

 
        /// 
        /// Indicates the style properties of command rows. 
        ///  
        [
        WebCategory("Styles"), 
        DefaultValue(null),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
        NotifyParentProperty(true),
        PersistenceMode(PersistenceMode.InnerProperty), 
        WebSysDescription(SR.DetailsView_CommandRowStyle)
        ] 
        public TableItemStyle CommandRowStyle { 
            get {
                if (_commandRowStyle == null) { 
                    _commandRowStyle = new TableItemStyle();
                    if (IsTrackingViewState)
                        ((IStateManager)_commandRowStyle).TrackViewState();
                } 
                return _commandRowStyle;
            } 
        } 

 
        [
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public DetailsViewMode CurrentMode {
            get { 
                return Mode; 
            }
        } 

        // implement this publicly so DataBinder.Eval(container.DataItem, "x") still works.
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ] 
        public virtual object DataItem { 
            get {
                if (CurrentMode == DetailsViewMode.Insert) { 
                    return null;
                }
                return _dataItem;
            } 
        }
 
        [ 
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public int DataItemCount {
            get {
                return PageCount; 
            }
        } 
 
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ]
        public virtual int DataItemIndex {
            get { 
                if (CurrentMode == DetailsViewMode.Insert) {
                    return -1; 
                } 
                return _dataItemIndex;
            } 
        }


        [ 
        DefaultValue(null),
        Editor("System.Web.UI.Design.WebControls.DataFieldEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), 
        TypeConverterAttribute(typeof(StringArrayConverter)), 
        WebCategory("Data"),
        WebSysDescription(SR.DataControls_DataKeyNames) 
        ]
        public virtual string[] DataKeyNames {
            get {
                object o = _dataKeyNames; 
                if (o != null) {
                    return(string[])((string[])o).Clone(); 
                } 
                return new string[0];
            } 
            set {
                if (!DataBoundControlHelper.CompareStringArrays(value, DataKeyNamesInternal)) {
                    if (value != null) {
                        _dataKeyNames = (string[])value.Clone(); 
                    }
                    else { 
                        _dataKeyNames = null; 
                    }
 
                    _keyTable = null;
                    if (Initialized) {
                        RequiresDataBinding = true;
                    } 
                }
            } 
        } 

        // This version doesn't clone the array 
        private string[] DataKeyNamesInternal {
            get {
                object o = _dataKeyNames;
                if (o != null) { 
                    return (string[])o;
                } 
                return new string[0]; 
            }
        } 

        /// 
        /// 
        [ 
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        WebSysDescription(SR.DetailsView_DataKey) 
        ]
        public virtual DataKey DataKey { 
            get {
                if (_dataKey == null) {
                    _dataKey = new DataKey(KeyTable);
                } 
                return _dataKey;
            } 
        } 

 
        [
        WebCategory("Behavior"),
        DefaultValue(DetailsViewMode.ReadOnly),
        WebSysDescription(SR.View_DefaultMode) 
        ]
        public virtual DetailsViewMode DefaultMode { 
            get { 
                return _defaultMode;
            } 
            set {
                if (value < DetailsViewMode.ReadOnly || value > DetailsViewMode.Insert) {
                    throw new ArgumentOutOfRangeException("value");
                } 
                _defaultMode = value;
            } 
        } 

 
        /// 
        /// Indicates the style properties of each row when in edit mode.
        /// 
        [ 
        WebCategory("Styles"),
        DefaultValue(null), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content), 
        NotifyParentProperty(true),
        PersistenceMode(PersistenceMode.InnerProperty), 
        WebSysDescription(SR.View_EditRowStyle)
        ]
        public TableItemStyle EditRowStyle {
            get { 
                if (_editRowStyle == null) {
                    _editRowStyle = new TableItemStyle(); 
                    if (IsTrackingViewState) 
                        ((IStateManager)_editRowStyle).TrackViewState();
                } 
                return _editRowStyle;
            }
        }
 

        ///  
        /// Indicates the style properties of null rows. 
        /// 
        [ 
        WebCategory("Styles"),
        DefaultValue(null),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
        NotifyParentProperty(true), 
        PersistenceMode(PersistenceMode.InnerProperty),
        WebSysDescription(SR.View_EmptyDataRowStyle) 
        ] 
        public TableItemStyle EmptyDataRowStyle {
            get { 
                if (_emptyDataRowStyle == null) {
                    _emptyDataRowStyle = new TableItemStyle();
                    if (IsTrackingViewState)
                        ((IStateManager)_emptyDataRowStyle).TrackViewState(); 
                }
                return _emptyDataRowStyle; 
            } 
        }
 

        /// 
        /// Indicates the template to use when no records are returned from the datasource within the DetailsView.
        ///  
        [
        Browsable(false), 
        DefaultValue(null), 
        PersistenceMode(PersistenceMode.InnerProperty),
        TemplateContainer(typeof(DetailsView)), 
        WebSysDescription(SR.View_EmptyDataTemplate)
        ]
        public virtual ITemplate EmptyDataTemplate {
            get { 
                return _emptyDataTemplate;
            } 
            set { 
                _emptyDataTemplate = value;
            } 
        }


        ///  
        /// The header text displayed if no EmptyDataTemplate is defined.
        ///  
        [ 
        Localizable(true),
        WebCategory("Appearance"), 
        DefaultValue(""),
        WebSysDescription(SR.View_EmptyDataText),
        ]
        public virtual String EmptyDataText { 
            get {
                object o = ViewState["EmptyDataText"]; 
                if (o != null) { 
                    return (string)o;
                } 
                return String.Empty;
            }
            set {
                ViewState["EmptyDataText"] = value; 
            }
        } 
 
        [
        WebCategory("Behavior"), 
        DefaultValue(false),
        WebSysDescription(SR.DetailsView_EnablePagingCallbacks)
        ]
        public virtual bool EnablePagingCallbacks { 
            get {
                object o = ViewState["EnablePagingCallbacks"]; 
                if (o != null) { 
                    return (bool)o;
                } 
                return false;
            }
            set {
                ViewState["EnablePagingCallbacks"] = value; 
            }
        } 
 

        ///  
        /// Indicates the style properties of the header column.
        /// 
        [
        WebCategory("Styles"), 
        DefaultValue(null),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content), 
        NotifyParentProperty(true), 
        PersistenceMode(PersistenceMode.InnerProperty),
        WebSysDescription(SR.DetailsView_FieldHeaderStyle) 
        ]
        public TableItemStyle FieldHeaderStyle {
            get {
                if (_fieldHeaderStyle == null) { 
                    _fieldHeaderStyle = new TableItemStyle();
                    if (IsTrackingViewState) 
                        ((IStateManager)_fieldHeaderStyle).TrackViewState(); 
                }
                return _fieldHeaderStyle; 
            }
        }

 
        /// 
        /// Gets a collection of  controls in the . This property is read-only. 
        ///  
        [
        DefaultValue(null), 
        Editor("System.Web.UI.Design.WebControls.DataControlFieldTypeEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)),
        MergableProperty(false),
        PersistenceMode(PersistenceMode.InnerProperty),
        WebCategory("Default"), 
        WebSysDescription(SR.DetailsView_Fields)
        ] 
        public virtual DataControlFieldCollection Fields { 
            get {
                if (_fieldCollection == null) { 
                    _fieldCollection = new DataControlFieldCollection();
                    _fieldCollection.FieldsChanged += new EventHandler(OnFieldsChanged);
                    if (IsTrackingViewState)
                        ((IStateManager)_fieldCollection).TrackViewState(); 
                }
                return _fieldCollection; 
            } 
        }
 
        private int FirstDisplayedPageIndex {
            get {
                object o = ViewState["FirstDisplayedPageIndex"];
                if (o != null) { 
                    return (int)o;
                } 
                return -1; 
            }
            set { 
                ViewState["FirstDisplayedPageIndex"] = value;
            }
        }
 

        [ 
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        ] 
        public virtual DetailsViewRow FooterRow {
            get {
                if (_footerRow == null) {
                    EnsureChildControls(); 
                }
                return _footerRow; 
            } 
        }
 

        /// 
        /// Indicates the style properties of the footer row.
        ///  
        [
        WebCategory("Styles"), 
        DefaultValue(null), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
        NotifyParentProperty(true), 
        PersistenceMode(PersistenceMode.InnerProperty),
        WebSysDescription(SR.DetailsView_FooterStyle)
        ]
        public TableItemStyle FooterStyle { 
            get {
                if (_footerStyle == null) { 
                    _footerStyle = new TableItemStyle(); 
                    if (IsTrackingViewState)
                        ((IStateManager)_footerStyle).TrackViewState(); 
                }
                return _footerStyle;
            }
        } 

 
        ///  
        /// Indicates the template to use for a footer item within the DetailsView.
        ///  
        [
        Browsable(false),
        DefaultValue(null),
        PersistenceMode(PersistenceMode.InnerProperty), 
        TemplateContainer(typeof(DetailsView)),
        WebSysDescription(SR.DetailsView_FooterTemplate) 
        ] 
        public virtual ITemplate FooterTemplate {
            get { 
                return _footerTemplate;
            }
            set {
                _footerTemplate = value; 
            }
        } 
 

        ///  
        /// The header text displayed if no FooterTemplate is defined.
        /// 
        [
        Localizable(true), 
        WebCategory("Appearance"),
        DefaultValue(""), 
        WebSysDescription(SR.View_FooterText), 
        ]
        public virtual String FooterText { 
            get {
                object o = ViewState["FooterText"];
                if (o != null) {
                    return (string)o; 
                }
                return String.Empty; 
            } 
            set {
                ViewState["FooterText"] = value; 
            }
        }

 
        /// 
        /// Gets or sets a value that specifies the grid line style. 
        ///  
        [
        WebCategory("Appearance"), 
        DefaultValue(GridLines.Both),
        WebSysDescription(SR.DataControls_GridLines)
        ]
        public virtual GridLines GridLines { 
            get {
                if (ControlStyleCreated == false) { 
                    return GridLines.Both; 
                }
                return((TableStyle)ControlStyle).GridLines; 
            }
            set {
                ((TableStyle)ControlStyle).GridLines = value;
            } 
        }
 
 
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        ]
        public virtual DetailsViewRow HeaderRow {
            get { 
                if (_headerRow == null) {
                    EnsureChildControls(); 
                } 
                return _headerRow;
            } 
        }


        ///  
        /// Indicates the style properties of the header row.
        ///  
        [ 
        WebCategory("Styles"),
        DefaultValue(null), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
        NotifyParentProperty(true),
        PersistenceMode(PersistenceMode.InnerProperty),
        WebSysDescription(SR.WebControl_HeaderStyle) 
        ]
        public TableItemStyle HeaderStyle { 
            get { 
                if (_headerStyle == null) {
                    _headerStyle = new TableItemStyle(); 
                    if (IsTrackingViewState)
                        ((IStateManager)_headerStyle).TrackViewState();
                }
                return _headerStyle; 
            }
        } 
 

        ///  
        /// Indicates the template to use for a header item within the DetailsView.
        /// 
        [
        Browsable(false), 
        DefaultValue(null),
        PersistenceMode(PersistenceMode.InnerProperty), 
        TemplateContainer(typeof(DetailsView)), 
        WebSysDescription(SR.WebControl_HeaderTemplate)
        ] 
        public virtual ITemplate HeaderTemplate {
            get {
                return _headerTemplate;
            } 
            set {
                _headerTemplate = value; 
            } 
        }
 

        /// 
        /// The header text displayed if no HeaderTemplate is defined.
        ///  
        [
        Localizable(true), 
        WebCategory("Appearance"), 
        DefaultValue(""),
        WebSysDescription(SR.View_HeaderText), 
        ]
        public virtual String HeaderText {
            get {
                object o = ViewState["HeaderText"]; 
                if (o != null) {
                    return (string)o; 
                } 
                return String.Empty;
            } 
            set {
                ViewState["HeaderText"] = value;
            }
        } 

 
        ///  
        /// Gets or sets a value that specifies the alignment of a rows with respect
        /// surrounding text. 
        /// 
        [
        Category("Layout"),
        DefaultValue(HorizontalAlign.NotSet), 
        WebSysDescription(SR.WebControl_HorizontalAlign)
        ] 
        public virtual HorizontalAlign HorizontalAlign { 
            get {
                if (ControlStyleCreated == false) { 
                    return HorizontalAlign.NotSet;
                }
                return((TableStyle)ControlStyle).HorizontalAlign;
            } 
            set {
                ((TableStyle)ControlStyle).HorizontalAlign = value; 
            } 
        }
 

        /// 
        /// Indicates the style properties of each row when in insert mode.
        ///  
        [
        WebCategory("Styles"), 
        DefaultValue(null), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
        NotifyParentProperty(true), 
        PersistenceMode(PersistenceMode.InnerProperty),
        WebSysDescription(SR.View_InsertRowStyle)
        ]
        public TableItemStyle InsertRowStyle { 
            get {
                if (_insertRowStyle == null) { 
                    _insertRowStyle = new TableItemStyle(); 
                    if (IsTrackingViewState)
                        ((IStateManager)_insertRowStyle).TrackViewState(); 
                }
                return _insertRowStyle;
            }
        } 

        private OrderedDictionary KeyTable { 
            get { 
                if (_keyTable == null) {
                    _keyTable = new OrderedDictionary(DataKeyNamesInternal.Length); 
                }
                return _keyTable;
            }
        } 

 
        private DetailsViewMode Mode { 
            get {
                // if the mode wasn't explicitly set by LoadControlState or by the user, the mode is the DefaultMode. 
                if (!_modeSet || DesignMode) {
                    _mode = DefaultMode;
                    _modeSet = true;
                } 
                return _mode;
            } 
            set { 
                if (value < DetailsViewMode.ReadOnly || value > DetailsViewMode.Insert) {
                    throw new ArgumentOutOfRangeException("value"); 
                }

                _modeSet = true;
                if (_mode != value) { 
                    _mode = value;
                    if (Initialized) { 
                        RequiresDataBinding = true; 
                    }
                } 
            }
        }

 
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public virtual int PageCount { 
            get {
                return _pageCount;
            }
        } 

        ///  
        ///    Gets or sets the index of the currently displayed record. 
        ///     This property echos the public one so that we can set PageIndex to -1
        ///     internally when we switch to insert mode, but users should never do that. 
        /// 
        private int PageIndexInternal {
            get {
                return _pageIndex; 
            }
            set { 
                int currentPageIndex = PageIndexInternal; 
                if (value != currentPageIndex) {
                    _pageIndex = value; 
                    if (Initialized) {
                        RequiresDataBinding = true;
                    }
                } 
            }
        } 
 

        ///  
        /// Gets or sets the index of the currently displayed record.
        /// 
        [
        Bindable(true), 
        DefaultValue(0),
        WebCategory("Data"), 
        WebSysDescription(SR.DetailsView_PageIndex) 
        ]
        public virtual int PageIndex { 
            get {
                // if we're in design mode, we don't want a change to the mode to set the PageIndex to -1.
                if (Mode == DetailsViewMode.Insert && !DesignMode) {
                    return -1; 
                }
                return PageIndexInternal; 
            } 
            set {
                // since we don't know at property set time how many DataItems we'll have, 
                // don't throw if we're above PageCount
                if (value < -1) {
                    throw new ArgumentOutOfRangeException("value");
                } 
                if (value >= 0) {
                    PageIndexInternal = value; 
                } 
            }
        } 


        /// 
        /// Gets the settings of the pager buttons for the 
        /// . This
        /// property is read-only. 
        ///  
        [
        WebCategory("Paging"), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
        NotifyParentProperty(true),
        PersistenceMode(PersistenceMode.InnerProperty),
        WebSysDescription(SR.DetailsView_PagerSettings) 
        ]
        public virtual PagerSettings PagerSettings { 
            get { 
                if (_pagerSettings == null) {
                    _pagerSettings = new PagerSettings(); 
                    if (IsTrackingViewState) {
                        ((IStateManager)_pagerSettings).TrackViewState();
                    }
                    _pagerSettings.PropertyChanged += new EventHandler(OnPagerPropertyChanged); 
                }
                return _pagerSettings; 
            } 
        }
 

        /// 
        /// Gets the style properties of the pager rows for the
        /// . This 
        /// property is read-only.
        ///  
        [ 
        WebCategory("Styles"),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content), 
        NotifyParentProperty(true),
        PersistenceMode(PersistenceMode.InnerProperty),
        WebSysDescription(SR.WebControl_PagerStyle)
        ] 
        public TableItemStyle PagerStyle {
            get { 
                if (_pagerStyle == null) { 
                    _pagerStyle = new TableItemStyle();
                    if (IsTrackingViewState) 
                        ((IStateManager)_pagerStyle).TrackViewState();
                }
                return _pagerStyle;
            } 
        }
 
 
        /// 
        /// Indicates the template to use for a pager item within the DetailsView. 
        /// 
        [
        Browsable(false),
        DefaultValue(null), 
        PersistenceMode(PersistenceMode.InnerProperty),
        TemplateContainer(typeof(DetailsView)), 
        WebSysDescription(SR.View_PagerTemplate) 
        ]
        public virtual ITemplate PagerTemplate { 
            get {
                return _pagerTemplate;
            }
            set { 
                _pagerTemplate = value;
            } 
        } 

 
        /// 
        /// Gets a collection of  objects representing the individual
        /// rows within the control.
        /// This property is read-only. 
        /// 
        [ 
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        WebSysDescription(SR.DetailsView_Rows) 
        ]
        public virtual DetailsViewRowCollection Rows {
            get {
                if (_rowsCollection == null) { 
                    if (_rowsArray == null) {
                        EnsureChildControls(); 
                    } 
                    if (_rowsArray == null) {
                        _rowsArray = new ArrayList(); 
                    }
                    _rowsCollection = new DetailsViewRowCollection(_rowsArray);
                }
                return _rowsCollection; 
            }
        } 
 

        ///  
        /// Indicates the style properties of each row.
        /// 
        [
        WebCategory("Styles"), 
        DefaultValue(null),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content), 
        NotifyParentProperty(true), 
        PersistenceMode(PersistenceMode.InnerProperty),
        WebSysDescription(SR.View_RowStyle) 
        ]
        public TableItemStyle RowStyle {
            get {
                if (_rowStyle == null) { 
                    _rowStyle = new TableItemStyle();
                    if (IsTrackingViewState) 
                        ((IStateManager)_rowStyle).TrackViewState(); 
                }
                return _rowStyle; 
            }
        }

 
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public object SelectedValue { 
            get {
                return DataKey.Value;
            }
        } 

        protected override HtmlTextWriterTag TagKey { 
            get { 
                return EnablePagingCallbacks ?
                    HtmlTextWriterTag.Div : HtmlTextWriterTag.Table; 
            }
        }

 
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        ]
        public virtual DetailsViewRow TopPagerRow { 
            get {
                if (_topPagerRow == null) {
                    EnsureChildControls();
                } 
                return _topPagerRow;
            } 
        } 

 
        /// 
        /// Occurs when a command is issued from the DetailsView.
        /// 
        [ 
        WebCategory("Action"),
        WebSysDescription(SR.DetailsView_OnItemCommand) 
        ] 
        public event DetailsViewCommandEventHandler ItemCommand {
            add { 
                Events.AddHandler(EventItemCommand, value);
            }
            remove {
                Events.RemoveHandler(EventItemCommand, value); 
            }
        } 
 

        ///  
        /// Occurs when a row is created.
        /// 
        [
        WebCategory("Behavior"), 
        WebSysDescription(SR.DetailsView_OnItemCreated)
        ] 
        public event EventHandler ItemCreated { 
            add {
                Events.AddHandler(EventItemCreated, value); 
            }
            remove {
                Events.RemoveHandler(EventItemCreated, value);
            } 
        }
 
 
        /// 
        /// Occurs when the DetailsView item has been deleted. 
        /// 
        [
        WebCategory("Action"),
        WebSysDescription(SR.DataControls_OnItemDeleted) 
        ]
        public event DetailsViewDeletedEventHandler ItemDeleted { 
            add { 
                Events.AddHandler(EventItemDeleted, value);
            } 
            remove {
                Events.RemoveHandler(EventItemDeleted, value);
            }
        } 

 
        ///  
        /// Occurs when the DetailsView item is being deleted.
        ///  
        [
        WebCategory("Action"),
        WebSysDescription(SR.DataControls_OnItemDeleting)
        ] 
        public event DetailsViewDeleteEventHandler ItemDeleting {
            add { 
                Events.AddHandler(EventItemDeleting, value); 
            }
            remove { 
                Events.RemoveHandler(EventItemDeleting, value);
            }
        }
 

        ///  
        /// Occurs when the DetailsView item has been inserted. 
        /// 
        [ 
        WebCategory("Action"),
        WebSysDescription(SR.DataControls_OnItemInserted)
        ]
        public event DetailsViewInsertedEventHandler ItemInserted { 
            add {
                Events.AddHandler(EventItemInserted, value); 
            } 
            remove {
                Events.RemoveHandler(EventItemInserted, value); 
            }
        }

 
        /// 
        /// Occurs when the DetailsView item is being inserted. 
        ///  
        [
        WebCategory("Action"), 
        WebSysDescription(SR.DataControls_OnItemInserting)
        ]
        public event DetailsViewInsertEventHandler ItemInserting {
            add { 
                Events.AddHandler(EventItemInserting, value);
            } 
            remove { 
                Events.RemoveHandler(EventItemInserting, value);
            } 
        }


        ///  
        /// Occurs when the DetailsView item has been updated.
        ///  
        [ 
        WebCategory("Action"),
        WebSysDescription(SR.DataControls_OnItemUpdated) 
        ]
        public event DetailsViewUpdatedEventHandler ItemUpdated {
            add {
                Events.AddHandler(EventItemUpdated, value); 
            }
            remove { 
                Events.RemoveHandler(EventItemUpdated, value); 
            }
        } 


        /// 
        /// Occurs when the DetailsView item is being updated. 
        /// 
        [ 
        WebCategory("Action"), 
        WebSysDescription(SR.DataControls_OnItemUpdating)
        ] 
        public event DetailsViewUpdateEventHandler ItemUpdating {
            add {
                Events.AddHandler(EventItemUpdating, value);
            } 
            remove {
                Events.RemoveHandler(EventItemUpdating, value); 
            } 
        }
 

        /// 
        /// Occurs when the ViewMode has changed.
        ///  
        [
        WebCategory("Action"), 
        WebSysDescription(SR.DetailsView_OnModeChanged) 
        ]
        public event EventHandler ModeChanged { 
            add {
                Events.AddHandler(EventModeChanged, value);
            }
            remove { 
                Events.RemoveHandler(EventModeChanged, value);
            } 
        } 

 
        /// 
        /// Occurs when the ViewMode is changing.
        /// 
        [ 
        WebCategory("Action"),
        WebSysDescription(SR.DetailsView_OnModeChanging) 
        ] 
        public event DetailsViewModeEventHandler ModeChanging {
            add { 
                Events.AddHandler(EventModeChanging, value);
            }
            remove {
                Events.RemoveHandler(EventModeChanging, value); 
            }
        } 
 

        ///  
        /// Occurs when the DetailsView PageIndex has been changed.
        /// 
        [
        WebCategory("Action"), 
        WebSysDescription(SR.DetailsView_OnPageIndexChanged)
        ] 
        public event EventHandler PageIndexChanged { 
            add {
                Events.AddHandler(EventPageIndexChanged, value); 
            }
            remove {
                Events.RemoveHandler(EventPageIndexChanged, value);
            } 
        }
 
 
        /// 
        /// Occurs when the DetailsView PageIndex is changing. 
        /// 
        [
        WebCategory("Action"),
        WebSysDescription(SR.DetailsView_OnPageIndexChanging) 
        ]
        public event DetailsViewPageEventHandler PageIndexChanging { 
            add { 
                Events.AddHandler(EventPageIndexChanging, value);
            } 
            remove {
                Events.RemoveHandler(EventPageIndexChanging, value);
            }
        } 

        ///  
        /// Builds the callback argument used in DataControlLinkButtons. 
        /// 
        private string BuildCallbackArgument(int pageIndex) { 
            return "\"" + Convert.ToString(pageIndex, CultureInfo.InvariantCulture) + "|\"";
        }

 
        public void ChangeMode(DetailsViewMode newMode) {
            Mode = newMode; 
        } 

 
        /// 
        /// Create a single autogenerated row.  This function can be overridden to create a different AutoGeneratedField.
        /// 
        protected virtual AutoGeneratedField CreateAutoGeneratedRow(AutoGeneratedFieldProperties fieldProperties) { 
            AutoGeneratedField field = new AutoGeneratedField(fieldProperties.DataField);
            string name = fieldProperties.Name; 
            ((IStateManager)field).TrackViewState(); 

            field.HeaderText = name; 
            field.SortExpression = name;
            field.ReadOnly = fieldProperties.IsReadOnly;
            field.DataType = fieldProperties.Type;
 
            return field;
        } 
 

        ///  
        /// Creates the set of AutoGenerated rows.  This function cannot be overridden because then if someone
        /// overrides it to add another type of DataControlField to the control, we have to manage the states of those
        /// fields along with their types.
        ///  
        protected virtual ICollection CreateAutoGeneratedRows(object dataItem) {
            if (dataItem == null) { 
                // note that we're not throwing an exception in this case, and the calling 
                // code should be able to handle a null arraylist being returned
                return null; 
            }

            ArrayList generatedFields = new ArrayList();
            PropertyDescriptorCollection propDescs = null; 
            bool throwException = true;
            Type dataItemType = null; 
 
            _autoGenFieldProps = new ArrayList();
 
            if (dataItem != null)
                dataItemType = dataItem.GetType();

            if ((dataItem != null) && (dataItem is ICustomTypeDescriptor)) { 
                // Get the custom properties of the object
                propDescs = TypeDescriptor.GetProperties(dataItem); 
            } else if (dataItemType != null) { 
                // directly bindable types: strings, ints etc. get treated specially, since we
                // don't care about their properties, but rather we care about them directly 
                if (IsBindableType(dataItemType)) {
                    AutoGeneratedFieldProperties fieldProps = new AutoGeneratedFieldProperties();
                    ((IStateManager)fieldProps).TrackViewState();
 
                    fieldProps.Name = "Item";
                    fieldProps.DataField = AutoGeneratedField.ThisExpression; 
                    fieldProps.Type = dataItemType; 

                    AutoGeneratedField field = CreateAutoGeneratedRow(fieldProps); 
                    if (field != null) {
                        generatedFields.Add(field);
                        _autoGenFieldProps.Add(fieldProps);
                    } 

                } else { 
                    // complex type... we get its properties 
                    propDescs = TypeDescriptor.GetProperties(dataItemType);
                } 
            }

            if ((propDescs != null) && (propDescs.Count != 0)) {
                string[] dataKeyNames = DataKeyNamesInternal; 
                int keyNamesLength = dataKeyNames.Length;
                string [] dataKeyNamesCaseInsensitive = new string[keyNamesLength]; 
                for (int i = 0; i < keyNamesLength; i++) { 
                    dataKeyNamesCaseInsensitive[i] = dataKeyNames[i].ToLowerInvariant();
                } 
                foreach (PropertyDescriptor pd in propDescs) {
                    Type propertyType = pd.PropertyType;
                    if (IsBindableType(propertyType)) {
                        string name = pd.Name; 
                        bool isKey = ((IList)dataKeyNamesCaseInsensitive).Contains(name.ToLowerInvariant());
                        AutoGeneratedFieldProperties fieldProps = new AutoGeneratedFieldProperties(); 
                        ((IStateManager)fieldProps).TrackViewState(); 

                        fieldProps.Name = name; 
                        fieldProps.IsReadOnly = isKey;
                        fieldProps.Type = propertyType;
                        fieldProps.DataField = name;
 
                        AutoGeneratedField field = CreateAutoGeneratedRow(fieldProps);
                        if (field != null) { 
                            generatedFields.Add(field); 
                            _autoGenFieldProps.Add(fieldProps);
                        } 
                    }
                }
            }
 
            if ((generatedFields.Count == 0) && throwException) {
                // this handles the case where we got back something that either had no 
                // properties, or all properties were not bindable. 
                throw new HttpException(SR.GetString(SR.DetailsView_NoAutoGenFields, ID));
            } 

            return generatedFields;
        }
 

        ///  
        /// Creates the control hierarchy that is used to render the DetailsView. 
        /// This is called whenever a control hierarchy is needed and the
        /// ChildControlsCreated property is false. 
        /// The implementation assumes that all the children in the controls
        /// collection have already been cleared.
        /// 
        protected override int CreateChildControls(IEnumerable dataSource, bool dataBinding) { 
            PagedDataSource pagedDataSource = null;
            int itemIndex = PageIndex; 
            bool allowPaging = AllowPaging; 
            int itemCount = 0;
            DetailsViewMode mode = Mode; 

            // if we're in design mode, PageIndex doesn't return -1
            if (DesignMode && mode == DetailsViewMode.Insert) {
                itemIndex = -1; 
            }
 
            if (dataBinding) { 
                DataSourceView view = GetData();
                DataSourceSelectArguments arguments = SelectArguments; 

                if (view == null) {
                    throw new HttpException(SR.GetString(SR.DataBoundControl_NullView, ID));
                } 

                if (mode != DetailsViewMode.Insert) { 
                    if (allowPaging && !view.CanPage) { 
                        if (dataSource != null && !(dataSource is ICollection)) {
                            arguments.StartRowIndex = itemIndex; 
                            arguments.MaximumRows = 1;
                            // This should throw an exception saying the data source can't page.
                            // We do this because the data source can provide a better error message than we can.
                            view.Select(arguments, SelectCallback); 
                        }
                    } 
 
                    if (_useServerPaging) {
                        if (view.CanRetrieveTotalRowCount) { 
                            pagedDataSource = CreateServerPagedDataSource(arguments.TotalRowCount);
                        }
                        else {
                            ICollection dataSourceCollection = dataSource as ICollection; 
                            if (dataSourceCollection == null) {
                                throw new HttpException(SR.GetString(SR.DataBoundControl_NeedICollectionOrTotalRowCount, GetType().Name)); 
                            } 
                            pagedDataSource = CreateServerPagedDataSource(checked(PageIndex + dataSourceCollection.Count));
                        } 
                    }
                    else {
                        pagedDataSource = CreatePagedDataSource();
                    } 
                }
            } 
            else { 
                pagedDataSource = CreatePagedDataSource();
            } 

            if (mode != DetailsViewMode.Insert) {
                pagedDataSource.DataSource = dataSource;
            } 

            IEnumerator dataSourceEnumerator = null; 
            OrderedDictionary keyTable = KeyTable; 

            _rowsArray = new ArrayList(); 
            _rowsCollection = null;

            if (dataBinding == false) {
                dataSourceEnumerator = dataSource.GetEnumerator(); 

                ICollection collection = dataSource as ICollection; 
                if (collection == null) { 
                    throw new HttpException(SR.GetString(SR.DataControls_DataSourceMustBeCollectionWhenNotDataBinding));
                } 
                itemCount = collection.Count;
            } else {
                keyTable.Clear();
                if (dataSource != null) { 
                    if (mode != DetailsViewMode.Insert) {
                        ICollection collection = dataSource as ICollection; 
                        if ((collection == null) && (pagedDataSource.IsPagingEnabled && !pagedDataSource.IsServerPagingEnabled)) { 
                            throw new HttpException(SR.GetString(SR.DetailsView_DataSourceMustBeCollection, ID));
                        } 

                        if (pagedDataSource.IsPagingEnabled) {
                            itemCount = pagedDataSource.DataSourceCount;
                        } 
                        else if (collection != null) {
                            itemCount = collection.Count; 
                        } 
                    }
                    dataSourceEnumerator = dataSource.GetEnumerator(); 
                }
            }

            Table table = CreateTable(); 
            TableRowCollection rows = table.Rows;
            bool moveNextSucceeded = false; 
            object lastItem = null; 

            Controls.Add(table); 

            if (dataSourceEnumerator != null) {
                moveNextSucceeded = dataSourceEnumerator.MoveNext();    // goto the first item
            } 

            // if there are no items, only add the tablerow if there's a null template or null text 
            if (!moveNextSucceeded && mode != DetailsViewMode.Insert) { 
                // if we're in insert mode and we're not autogenerating rows, render the rows in insert mode
                if (itemIndex >= 0 || AutoGenerateRows) { 
                    if (EmptyDataText.Length > 0 || _emptyDataTemplate != null) {
                        _rowsArray.Add(CreateRow(0, DataControlRowType.EmptyDataRow, DataControlRowState.Normal, null, rows, null));
                    }
                    itemCount = 0; 
                }
            } 
            else { 
                int currentItemIndex = 0;
                if (!_useServerPaging) { 
                    // skip over the first records that are before the page we're showing
                    for (; currentItemIndex < itemIndex; currentItemIndex++) {
                        lastItem = dataSourceEnumerator.Current;
                        moveNextSucceeded = dataSourceEnumerator.MoveNext(); 
                        if (!moveNextSucceeded) {
                            _pageIndex = currentItemIndex; 
                            pagedDataSource.CurrentPageIndex = currentItemIndex; 
                            itemIndex = currentItemIndex;
                            break;  // never throw if the PageIndex is out of range: just fix up the current page and goto the last item. 
                        }
                    }
                }
 
                if (moveNextSucceeded) {
                    _dataItem = dataSourceEnumerator.Current; 
                } 
                else {
                    _dataItem = lastItem;   // if we broke out of the above loop, the current item will be invalid 
                }


                // If we're not using server paging and this isn't a collection, or server paging doesn't return a page count, our _pageCount isn't accurate. 
                // Loop through the rest of the enumeration to figure out how many items are in it.
                if ((!_useServerPaging && !(dataSource is ICollection)) || (_useServerPaging && itemCount < 0)) { 
                    itemCount = currentItemIndex; 
                    while (moveNextSucceeded) {
                        itemCount++; 
                        moveNextSucceeded = dataSourceEnumerator.MoveNext();
                    }
                }
 
                _dataItemIndex = currentItemIndex;
 
                bool singlePage = itemCount <= 1 && !_useServerPaging; // hide pagers if there's only one item 
                if (allowPaging && PagerSettings.Visible && _pagerSettings.IsPagerOnTop && !singlePage && mode != DetailsViewMode.Insert) {
                    // top pager 
                    _topPagerRow = CreateRow(-1, DataControlRowType.Pager, DataControlRowState.Normal, null, rows, pagedDataSource);
                }

                _headerRow = CreateRow(-1, DataControlRowType.Header, DataControlRowState.Normal, null, rows, null); 
                if (_headerTemplate == null && HeaderText.Length == 0) {
                    _headerRow.Visible = false; 
                } 

                _rowsArray.AddRange(CreateDataRows(dataBinding, rows, _dataItem)); 

                if (itemIndex >= 0) {
                    string[] keyFields = DataKeyNamesInternal;
                    if (dataBinding && (keyFields.Length != 0)) { 
                        foreach (string keyName in keyFields) {
                            object keyValue = DataBinder.GetPropertyValue(_dataItem, keyName); 
                            keyTable.Add(keyName, keyValue); 
                        }
                        _dataKey = new DataKey(keyTable); 
                    }
                }

                _footerRow = CreateRow(-1, DataControlRowType.Footer, DataControlRowState.Normal, null, rows, null); 
                if (_footerTemplate == null && FooterText.Length == 0) {
                    _footerRow.Visible = false; 
                } 

                if (allowPaging && PagerSettings.Visible && _pagerSettings.IsPagerOnBottom && !singlePage && mode != DetailsViewMode.Insert) { 
                    // bottom pager
                    _bottomPagerRow = CreateRow(-1, DataControlRowType.Pager, DataControlRowState.Normal, null, rows, pagedDataSource);
                }
            } 

            _pageCount = itemCount; 
 
            OnItemCreated(EventArgs.Empty);
 
            if (dataBinding) {
                DataBind(false);
            }
 
            return itemCount;
        } 
 

        ///  
        /// Creates new control style.
        /// 
        protected override Style CreateControlStyle() {
            TableStyle controlStyle = new TableStyle(); 

            // initialize defaults that are different from TableStyle 
            controlStyle.GridLines = GridLines.Both; 
            controlStyle.CellSpacing = 0;
 
            return controlStyle;
        }

        private ICollection CreateDataRows(bool dataBinding, TableRowCollection rows, object dataItem) { 
            ArrayList rowsArray = new ArrayList();
            rowsArray.AddRange(CreateDataRowsFromFields(dataItem, dataBinding, rows)); 
            return rowsArray; 
        }
 
        private ICollection CreateDataRowsFromFields(object dataItem, bool dataBinding, TableRowCollection rows) {
            int fieldCount = 0;
            ICollection fields = CreateFieldSet(dataItem, dataBinding);
            ArrayList rowsArray = new ArrayList(); 
            if (fields != null)
                fieldCount = fields.Count; 
 
            if (fieldCount > 0) {
                DataControlRowType rowType = DataControlRowType.DataRow; 
                DataControlRowState masterRowState = DataControlRowState.Normal;
                int dataRowIndex = 0;
                DetailsViewMode mode = Mode;
 
                if (mode == DetailsViewMode.Edit)
                    masterRowState |= DataControlRowState.Edit; 
                else if (mode == DetailsViewMode.Insert) 
                    masterRowState |= DataControlRowState.Insert;
 
                bool requiresDataBinding = false;
                foreach (DataControlField field in fields) {
                    if (field.Initialize(false, this)) {
                        requiresDataBinding = true; 
                    }
                    if (DetermineRenderClientScript()) { 
                        field.ValidateSupportsCallback(); 
                    }
 
                    DataControlRowState rowState = masterRowState;

                    if (dataRowIndex % 2 != 0) {
                        rowState |= DataControlRowState.Alternate; 
                    }
 
                    rowsArray.Add(CreateRow(dataRowIndex, rowType, rowState, field, rows, null)); 

                    dataRowIndex++; 
                }
                if (requiresDataBinding) {
                    RequiresDataBinding = true;
                } 
            }
            return rowsArray; 
        } 

        protected override DataSourceSelectArguments CreateDataSourceSelectArguments() { 
            DataSourceSelectArguments arguments = new DataSourceSelectArguments();
            DataSourceView view = GetData();
            _useServerPaging = AllowPaging && view.CanPage;
 
            // decide if we should use server-side paging
            if (_useServerPaging) { 
                arguments.StartRowIndex = PageIndex; 
                if (view.CanRetrieveTotalRowCount) {
                    arguments.RetrieveTotalRowCount = true; 
                    arguments.MaximumRows = 1;
                }
                else {
                    arguments.MaximumRows = -1; 
                }
            } 
 
            return arguments;
        } 


        /// 
        /// Creates the set of fields to be used to build up the control 
        /// hierarchy.
        /// When AutoGenerateRows is true, the fields are created to match the 
        /// datasource and are appended to the set of fields defined in the Fields 
        /// collection.
        ///  
        protected virtual ICollection CreateFieldSet(object dataItem, bool useDataSource) {
            ArrayList fieldsArray = new ArrayList();

            if (AutoGenerateRows == true) { 
                object[] autoFieldsArray = null;
                if (useDataSource) { 
                    ICollection autoFields = CreateAutoGeneratedRows(dataItem); 
                    if (autoFields != null) {
                        autoFieldsArray = new DataControlField[autoFields.Count]; 
                        autoFields.CopyTo(autoFieldsArray, 0);
                    }
                } else {
                    if (_autoGenFieldProps != null) { 
                        int autoGenFieldPropsCount = _autoGenFieldProps.Count;
                        autoFieldsArray = new DataControlField[autoGenFieldPropsCount]; 
                        for (int i = 0; i < autoGenFieldPropsCount; i++) { 
                            autoFieldsArray[i] = CreateAutoGeneratedRow((AutoGeneratedFieldProperties)_autoGenFieldProps[i]);
                        } 
                    }
                }

                if (autoFieldsArray != null) { 
                    int autoFieldCount = autoFieldsArray.Length;
 
                    for (int i = 0; i < autoFieldCount; i++) 
                        fieldsArray.Add(autoFieldsArray[i]);
                } 
            }

            foreach (DataControlField f in Fields) {
                fieldsArray.Add(f); 
            }
 
            if (AutoGenerateInsertButton || AutoGenerateDeleteButton || AutoGenerateEditButton) { 
                CommandField commandField = new CommandField();
                commandField.ButtonType = ButtonType.Link; 

                if (AutoGenerateInsertButton) {
                    commandField.ShowInsertButton = true;
                } 

                if (AutoGenerateDeleteButton) { 
                    commandField.ShowDeleteButton = true; 
                }
 
                if (AutoGenerateEditButton) {
                    commandField.ShowEditButton = true;
                }
                fieldsArray.Add(commandField); 
            }
 
            return fieldsArray; 
        }
 
        /// 
        /// Creates the pager for NextPrev and NextPrev with First and Last styles
        /// 
        private void CreateNextPrevPager(TableRow row, PagedDataSource pagedDataSource, bool addFirstLastPageButtons) { 
            PagerSettings pagerSettings = PagerSettings;
            string prevPageImageUrl = pagerSettings.PreviousPageImageUrl; 
            string nextPageImageUrl = pagerSettings.NextPageImageUrl; 
            bool isFirstPage = pagedDataSource.IsFirstPage;
            bool isLastPage = pagedDataSource.IsLastPage; 


            if (addFirstLastPageButtons && !isFirstPage) {
                string firstPageImageUrl = pagerSettings.FirstPageImageUrl; 
                TableCell cell = new TableCell();
                row.Cells.Add(cell); 
                IButtonControl firstButton; 
                if (firstPageImageUrl.Length > 0) {
                    firstButton = new DataControlImageButton(this); 
                    ((DataControlImageButton)firstButton).ImageUrl = firstPageImageUrl;
                    ((DataControlImageButton)firstButton).AlternateText = HttpUtility.HtmlDecode(pagerSettings.FirstPageText);
                    ((DataControlImageButton)firstButton).EnableCallback(BuildCallbackArgument(0));
                } else { 
                    firstButton = new DataControlPagerLinkButton(this);
                    ((DataControlPagerLinkButton)firstButton).Text = pagerSettings.FirstPageText; 
                    ((DataControlPagerLinkButton)firstButton).EnableCallback(BuildCallbackArgument(0)); 
                }
                firstButton.CommandName = DataControlCommands.PageCommandName; 
                firstButton.CommandArgument = DataControlCommands.FirstPageCommandArgument;
                cell.Controls.Add((Control)firstButton);
            }
 
            if (!isFirstPage) {
                IButtonControl prevButton; 
                TableCell cell = new TableCell(); 
                row.Cells.Add(cell);
                if (prevPageImageUrl.Length > 0) { 
                    prevButton = new DataControlImageButton(this);
                    ((DataControlImageButton)prevButton).ImageUrl = prevPageImageUrl;
                    ((DataControlImageButton)prevButton).AlternateText = HttpUtility.HtmlDecode(pagerSettings.PreviousPageText);
                    ((DataControlImageButton)prevButton).EnableCallback(BuildCallbackArgument(PageIndex - 1)); 
                } else {
                    prevButton = new DataControlPagerLinkButton(this); 
                    ((DataControlPagerLinkButton)prevButton).Text = pagerSettings.PreviousPageText; 
                    ((DataControlPagerLinkButton)prevButton).EnableCallback(BuildCallbackArgument(PageIndex - 1));
                } 
                prevButton.CommandName = DataControlCommands.PageCommandName;
                prevButton.CommandArgument = DataControlCommands.PreviousPageCommandArgument;
                cell.Controls.Add((Control)prevButton);
            } 

 
            if (!isLastPage) { 
                IButtonControl nextButton;
                TableCell cell = new TableCell(); 
                row.Cells.Add(cell);
                if (nextPageImageUrl.Length > 0) {
                    nextButton = new DataControlImageButton(this);
                    ((DataControlImageButton)nextButton).ImageUrl = nextPageImageUrl; 
                    ((DataControlImageButton)nextButton).AlternateText = HttpUtility.HtmlDecode(pagerSettings.NextPageText);
                    ((DataControlImageButton)nextButton).EnableCallback(BuildCallbackArgument(PageIndex + 1)); 
                } else { 
                    nextButton = new DataControlPagerLinkButton(this);
                    ((DataControlPagerLinkButton)nextButton).Text = pagerSettings.NextPageText; 
                    ((DataControlPagerLinkButton)nextButton).EnableCallback(BuildCallbackArgument(PageIndex + 1));
                }
                nextButton.CommandName = DataControlCommands.PageCommandName;
                nextButton.CommandArgument = DataControlCommands.NextPageCommandArgument; 
                cell.Controls.Add((Control)nextButton);
            } 
 
            if (addFirstLastPageButtons && !isLastPage) {
                string lastPageImageUrl = pagerSettings.LastPageImageUrl; 
                IButtonControl lastButton;
                TableCell cell = new TableCell();
                row.Cells.Add(cell);
                if (lastPageImageUrl.Length > 0) { 
                    lastButton = new DataControlImageButton(this);
                    ((DataControlImageButton)lastButton).ImageUrl = lastPageImageUrl; 
                    ((DataControlImageButton)lastButton).AlternateText = HttpUtility.HtmlDecode(pagerSettings.LastPageText); 
                    ((DataControlImageButton)lastButton).EnableCallback(BuildCallbackArgument(pagedDataSource.PageCount - 1));
                } else { 
                    lastButton = new DataControlPagerLinkButton(this);
                    ((DataControlPagerLinkButton)lastButton).Text = pagerSettings.LastPageText;
                    ((DataControlPagerLinkButton)lastButton).EnableCallback(BuildCallbackArgument(pagedDataSource.PageCount - 1));
                } 
                lastButton.CommandName = DataControlCommands.PageCommandName;
                lastButton.CommandArgument = DataControlCommands.LastPageCommandArgument; 
                cell.Controls.Add((Control)lastButton); 
            }
        } 

        /// 
        /// Creates the pager for NextPrev and NextPrev with First and Last styles
        ///  
        private void CreateNumericPager(TableRow row, PagedDataSource pagedDataSource, bool addFirstLastPageButtons) {
            PagerSettings pagerSettings = PagerSettings; 
 
            int pages = pagedDataSource.PageCount;
            int currentPage = pagedDataSource.CurrentPageIndex + 1; 
            int pageSetSize = pagerSettings.PageButtonCount;
            int pagesShown = pageSetSize;
            int firstDisplayedPage = FirstDisplayedPageIndex + 1;   // first page displayed on last postback
 
            // ensure the number of pages we show isn't more than the number of pages that do exist
            if (pages < pagesShown) 
                pagesShown = pages; 

            // initialize to the first page set, i.e., pages 1 through number of pages shown 
            int firstPage = 1;
            int lastPage = pagesShown;

            if (currentPage > lastPage) { 
                // The current page is not in the first page set, then we need to slide the
                // range of pages shown by adjusting firstPage and lastPage 
                int currentPageSet = (currentPage - 1) / pageSetSize; 
                bool currentPageInLastDisplayRange = currentPage - firstDisplayedPage >= 0 && currentPage - firstDisplayedPage < pageSetSize;
                if (firstDisplayedPage > 0 && currentPageInLastDisplayRange) { 
                    firstPage = firstDisplayedPage;
                }
                else {
                    firstPage = currentPageSet * pageSetSize + 1; 
                }
                lastPage = firstPage + pageSetSize - 1; 
 
                // now bring back lastPage into the range if its exceeded the number of pages
                if (lastPage > pages) 
                    lastPage = pages;

                // if theres room to show more pages from the previous page set, then adjust
                // the first page accordingly 
                if (lastPage - firstPage + 1 < pageSetSize) {
                    firstPage = Math.Max(1, lastPage - pageSetSize + 1); 
                } 
                FirstDisplayedPageIndex = firstPage - 1;
            } 

            LinkButton button;

            if (addFirstLastPageButtons && currentPage != 1 && firstPage != 1) { 
                string firstPageImageUrl = pagerSettings.FirstPageImageUrl;
                IButtonControl firstButton; 
                TableCell cell = new TableCell(); 
                row.Cells.Add(cell);
 
                if (firstPageImageUrl.Length > 0) {
                    firstButton = new DataControlImageButton(this);
                    ((DataControlImageButton)firstButton).ImageUrl = firstPageImageUrl;
                    ((DataControlImageButton)firstButton).AlternateText = HttpUtility.HtmlDecode(pagerSettings.FirstPageText); 
                    ((DataControlImageButton)firstButton).EnableCallback(BuildCallbackArgument(0));
                } else { 
                    firstButton = new DataControlPagerLinkButton(this); 
                    ((DataControlPagerLinkButton)firstButton).Text = pagerSettings.FirstPageText;
                    ((DataControlPagerLinkButton)firstButton).EnableCallback(BuildCallbackArgument(0)); 
                }
                firstButton.CommandName = DataControlCommands.PageCommandName;
                firstButton.CommandArgument = DataControlCommands.FirstPageCommandArgument;
                cell.Controls.Add((Control)firstButton); 
            }
 
            if (firstPage != 1) { 
                TableCell cell = new TableCell();
                row.Cells.Add(cell); 

                button = new DataControlPagerLinkButton(this);
                button.Text = "...";
                button.CommandName = DataControlCommands.PageCommandName; 
                button.CommandArgument = (firstPage - 1).ToString(NumberFormatInfo.InvariantInfo);
                ((DataControlPagerLinkButton)button).EnableCallback(BuildCallbackArgument(firstPage - 2)); 
                cell.Controls.Add(button); 
            }
 
            for (int i = firstPage; i <= lastPage; i++) {
                TableCell cell = new TableCell();
                row.Cells.Add(cell);
 
                string pageString = (i).ToString(NumberFormatInfo.InvariantInfo);
                if (i == currentPage) { 
                    Label label = new Label(); 

                    label.Text = pageString; 
                    cell.Controls.Add(label);
                } else {
                    button = new DataControlPagerLinkButton(this);
 
                    button.Text = pageString;
                    button.CommandName = DataControlCommands.PageCommandName; 
                    button.CommandArgument = pageString; 
                    ((DataControlPagerLinkButton)button).EnableCallback(BuildCallbackArgument(i - 1));
                    cell.Controls.Add(button); 
                }
            }

            if (pages > lastPage) { 
                TableCell cell = new TableCell();
                row.Cells.Add(cell); 
                button = new DataControlPagerLinkButton(this); 

                button.Text = "..."; 
                button.CommandName = DataControlCommands.PageCommandName;
                button.CommandArgument = (lastPage + 1).ToString(NumberFormatInfo.InvariantInfo);
                ((DataControlPagerLinkButton)button).EnableCallback(BuildCallbackArgument(lastPage));
                cell.Controls.Add(button); 
            }
 
            bool isLastPageShown = lastPage == pages; 
            if (addFirstLastPageButtons && currentPage != pages && !isLastPageShown) {
                string lastPageImageUrl = pagerSettings.LastPageImageUrl; 
                TableCell cell = new TableCell();
                row.Cells.Add(cell);

                IButtonControl lastButton; 
                if (lastPageImageUrl.Length > 0) {
                    lastButton = new DataControlImageButton(this); 
                    ((DataControlImageButton)lastButton).ImageUrl = lastPageImageUrl; 
                    ((DataControlImageButton)lastButton).AlternateText = HttpUtility.HtmlDecode(pagerSettings.LastPageText);
                    ((DataControlImageButton)lastButton).EnableCallback(BuildCallbackArgument(pagedDataSource.PageCount - 1)); 
                } else {
                    lastButton = new DataControlPagerLinkButton(this);
                    ((DataControlPagerLinkButton)lastButton).Text = pagerSettings.LastPageText;
                    ((DataControlPagerLinkButton)lastButton).EnableCallback(BuildCallbackArgument(pagedDataSource.PageCount - 1)); 
                }
                lastButton.CommandName = DataControlCommands.PageCommandName; 
                lastButton.CommandArgument = DataControlCommands.LastPageCommandArgument; 
                cell.Controls.Add((Control)lastButton);
            } 
        }

        private PagedDataSource CreatePagedDataSource() {
            PagedDataSource pagedDataSource = new PagedDataSource(); 

            pagedDataSource.CurrentPageIndex = PageIndex; 
            pagedDataSource.PageSize = 1; 
            pagedDataSource.AllowPaging = AllowPaging;
            pagedDataSource.AllowCustomPaging = false; 
            pagedDataSource.AllowServerPaging = false;
            pagedDataSource.VirtualCount = 0;

            return pagedDataSource; 
        }
 
        private PagedDataSource CreateServerPagedDataSource(int totalRowCount) { 
            PagedDataSource pagedDataSource = new PagedDataSource();
 
            pagedDataSource.CurrentPageIndex = PageIndex;
            pagedDataSource.PageSize = 1;
            pagedDataSource.AllowPaging = AllowPaging;
            pagedDataSource.AllowCustomPaging = false; 
            pagedDataSource.AllowServerPaging = true;
            pagedDataSource.VirtualCount = totalRowCount; 
 
            return pagedDataSource;
        } 

        private DetailsViewRow CreateRow(int rowIndex, DataControlRowType rowType, DataControlRowState rowState, DataControlField field, TableRowCollection rows, PagedDataSource pagedDataSource) {
            DetailsViewRow row = CreateRow(rowIndex, rowType, rowState);
 
            rows.Add(row);
            if (rowType != DataControlRowType.Pager) { 
                InitializeRow(row, field); 
            } else {
                InitializePager(row, pagedDataSource); 
            }

            return row;
        } 

 
        ///  
        /// [To be supplied.]
        ///  
        protected virtual DetailsViewRow CreateRow(int rowIndex, DataControlRowType rowType, DataControlRowState rowState) {
            if (rowType == DataControlRowType.Pager) {
                return new DetailsViewPagerRow(rowIndex, rowType, rowState);
            } 
            return new DetailsViewRow(rowIndex, rowType, rowState);
        } 
 

        ///  
        /// Creates a new Table, which is the containing table
        /// 
        protected virtual Table CreateTable() {
            return new ChildTable(String.IsNullOrEmpty(ID) ? null : ClientID); 
        }
 
        /// Data bound controls should override PerformDataBinding instead 
        /// of DataBind.  If DataBind if overridden, the OnDataBinding and OnDataBound events will
        /// fire in the wrong order.  However, for backwards compat on ListControl and AdRotator, we 
        /// can't seal this method.  It is sealed on all new BaseDataBoundControl-derived controls.
        public override sealed void DataBind() {
            base.DataBind();
        } 

        public virtual void DeleteItem() { 
            HandleDelete(String.Empty); 
        }
 
        private bool DetermineRenderClientScript() {
            // In a client script-enabled control, always determine whether to render the
            // client script-based functionality.
            // The decision should be based on browser capabilities. 

            if (!_renderClientScriptValid) { 
                _renderClientScript = false; 

                if (EnablePagingCallbacks && (Context != null) && (Page != null) && (Page.RequestInternal != null) && Page.Request.Browser.SupportsCallback && !IsParentedToUpdatePanel) { 
                    HttpBrowserCapabilities browserCaps = Page.Request.Browser;
                    bool hasEcmaScript = browserCaps.EcmaScriptVersion.Major > 0;
                    bool hasDOM = browserCaps.W3CDomVersion.Major > 0;
#if SHIPPINGADAPTERS 
                    bool isHtml4 = !(Page.PageAdapter is Html32PageAdapter) &&
                        (!StringUtil.EqualsIgnoreCase(browserCaps["tagwriter"], typeof(Html32TextWriter).FullName)); 
#else 
                    bool isHtml4 = (!StringUtil.EqualsIgnoreCase(browserCaps["tagwriter"], typeof(Html32TextWriter).FullName));
#endif 
                    _renderClientScript = hasEcmaScript && hasDOM && isHtml4;
                }
                _renderClientScriptValid = true;
            } 
            return _renderClientScript;
        } 
 
        /// 
        /// Override EnsureDataBound because we don't want to databind when we're in insert mode 
        /// 
        protected override void EnsureDataBound() {
            if (RequiresDataBinding && Mode == DetailsViewMode.Insert && !AutoGenerateRows) {
                OnDataBinding(EventArgs.Empty); 

                RequiresDataBinding = false; 
                MarkAsDataBound(); 
                if(_adapter != null) {
                    DataBoundControlAdapter dataBoundControlAdapter = _adapter as DataBoundControlAdapter; 
                    if(dataBoundControlAdapter != null) {
                        dataBoundControlAdapter.PerformDataBinding(null);
                    }
                    else { 
                        PerformDataBinding(null);
                    } 
                } 
                else {
                    PerformDataBinding(null); 
                }

                OnDataBound(EventArgs.Empty);
            } 
            else {
                base.EnsureDataBound(); 
            } 
        }
 

        protected virtual void ExtractRowValues(IOrderedDictionary fieldValues, bool includeReadOnlyFields, bool includeKeys) {
            if (fieldValues == null) {
                Debug.Assert(false, "DetailsView::ExtractRowValues- must hand in a valid reference to an IDictionary."); 
                return;
            } 
 
            ICollection fieldSet = CreateFieldSet(null, false);
            object[] fields = new object[fieldSet.Count]; 
            fieldSet.CopyTo(fields, 0);
            int cellIndex;
            DetailsViewRowCollection rows = Rows;
            string[] dataKeyNames = DataKeyNamesInternal; 

            // Field and row count should match, but if there was no data, or if the user removed some rows, 
            // these may no longer match.  Make sure we don't exceed the bounds. 
            for (int i = 0; i < fields.Length && i < rows.Count; i++) {
                cellIndex = 0; 
                if (((DataControlField)fields[i]).ShowHeader) {
                    cellIndex = 1;
                }
 
                if (!((DataControlField)fields[i]).Visible) {
                    continue; 
                } 

                OrderedDictionary newValues = new OrderedDictionary(); 

                ((DataControlField)fields[i]).ExtractValuesFromCell(newValues, rows[i].Cells[cellIndex] as DataControlFieldCell, rows[i].RowState, includeReadOnlyFields);
                foreach (DictionaryEntry entry in newValues) {
                    if (includeKeys || (Array.IndexOf(dataKeyNames, entry.Key) == -1)) { 
                        fieldValues[entry.Key] = entry.Value;
                    } 
                } 

            } 
        }

        protected virtual string GetCallbackResult() {
            StringWriter stringWriter = new StringWriter(CultureInfo.InvariantCulture); 
            //
            HtmlTextWriter writer = new HtmlTextWriter(stringWriter); 
            IStateFormatter formatter = Page.CreateStateFormatter(); 

            RenderTableContents(writer); 

            writer.Flush();
            writer.Close();
 
            object dataKeyState = OrderedDictionaryStateHelper.SaveViewState(KeyTable);
            string dataKeyString = formatter.Serialize(dataKeyState); 
 
            // this should return the html that goes in the panel, plus the new page info.
            return Convert.ToString(PageIndex, CultureInfo.InvariantCulture) + "|" + dataKeyString + "|" + stringWriter.ToString(); 
        }

        protected virtual string GetCallbackScript(IButtonControl buttonControl, string argument) {
            if (DetermineRenderClientScript()) { 
                if (!String.IsNullOrEmpty(argument)) {
                    if (Page != null) { 
                        Page.ClientScript.RegisterForEventValidation(UniqueID, argument); 
                    }
 
                    string clientCallbackReference = "javascript:__dv" + ClientID + ".callback";
                    return clientCallbackReference + "(" + argument + "); return false;";
                }
            } 
            return null;
        } 
 
        private void HandleCancel() {
            bool isBoundToDataSourceControl = IsBoundUsingDataSourceID; 

            DetailsViewModeEventArgs e = new DetailsViewModeEventArgs(DefaultMode, true);
            OnModeChanging(e);
 
            if (e.Cancel) {
                return; 
            } 

            if (isBoundToDataSourceControl) { 
                Mode = e.NewMode;
                OnModeChanged(EventArgs.Empty);
            }
 
            RequiresDataBinding = true;
        } 
 
        private void HandleDelete(string commandArg) {
            int pageIndex = PageIndex; 
            if (pageIndex < 0) {    // don't attempt to delete in Insert mode
                return;
            }
 
            DataSourceView view = null;
            bool isBoundToDataSourceControl = IsBoundUsingDataSourceID; 
 
            if (isBoundToDataSourceControl) {
                view = GetData(); 
                if (view == null) {
                    throw new HttpException(SR.GetString(SR.View_DataSourceReturnedNullView, ID));
                }
            } 

            DetailsViewDeleteEventArgs e = new DetailsViewDeleteEventArgs(pageIndex); 
 
            if (isBoundToDataSourceControl) {
                ExtractRowValues(e.Values, true/*includeReadOnlyFields*/, false/*includePrimaryKey*/); 
                foreach (DictionaryEntry entry in DataKey.Values) {
                    e.Keys.Add(entry.Key, entry.Value);
                    if (e.Values.Contains(entry.Key)) {
                        e.Values.Remove(entry.Key); 
                    }
                } 
            } 

            OnItemDeleting(e); 

            if (e.Cancel) {
                return;
            } 

            if (isBoundToDataSourceControl) { 
                _deleteKeys = e.Keys; 
                _deleteValues = e.Values;
                view.Delete(e.Keys, e.Values, HandleDeleteCallback); 
            }
        }

        private bool HandleDeleteCallback(int affectedRows, Exception ex) { 
            int pageIndex = PageIndex;
            DetailsViewDeletedEventArgs dea = new DetailsViewDeletedEventArgs(affectedRows, ex); 
            dea.SetKeys(_deleteKeys); 
            dea.SetValues(_deleteValues);
 
            OnItemDeleted(dea);

            _deleteKeys = null;
            _deleteValues = null; 

            if (ex != null && !dea.ExceptionHandled) { 
                return false; 
            }
 
            if (pageIndex == _pageCount - 1) {
                HandlePage(pageIndex - 1);
            }
 
            RequiresDataBinding = true;
            return true; 
        } 

        private void HandleEdit() { 
            if (PageIndex < 0) {
                return;
            }
 
            DetailsViewModeEventArgs e = new DetailsViewModeEventArgs(DetailsViewMode.Edit, false);
            OnModeChanging(e); 
 
            if (e.Cancel) {
                return; 
            }

            if (IsBoundUsingDataSourceID) {
                Mode = e.NewMode; 
                OnModeChanged(EventArgs.Empty);
            } 
 
            RequiresDataBinding = true;
        } 

        private bool HandleEvent(EventArgs e, bool causesValidation, string validationGroup) {
            bool handled = false;
 
            if (causesValidation && Page != null) {
                Page.Validate(validationGroup); 
            } 

            DetailsViewCommandEventArgs dce = e as DetailsViewCommandEventArgs; 

            if (dce != null) {

                OnItemCommand(dce); 
                handled = true;
 
                string command = dce.CommandName; 
                int newItemIndex = PageIndex;
 
                if (StringUtil.EqualsIgnoreCase(command, DataControlCommands.PageCommandName)) {
                    string itemIndexArg = (string)dce.CommandArgument;

                    if (StringUtil.EqualsIgnoreCase(itemIndexArg, DataControlCommands.NextPageCommandArgument)) { 
                        newItemIndex++;
                    } else if (StringUtil.EqualsIgnoreCase(itemIndexArg, DataControlCommands.PreviousPageCommandArgument)) { 
                        newItemIndex--; 
                    } else if (StringUtil.EqualsIgnoreCase(itemIndexArg, DataControlCommands.FirstPageCommandArgument)) {
                        newItemIndex = 0; 
                    } else if (StringUtil.EqualsIgnoreCase(itemIndexArg, DataControlCommands.LastPageCommandArgument)) {
                        newItemIndex = PageCount - 1;
                    } else {
                        // argument is page number, and page index is 1 less than that 
                        newItemIndex = Convert.ToInt32(itemIndexArg, CultureInfo.InvariantCulture) - 1;
                    } 
                    HandlePage(newItemIndex); 
                } else if (StringUtil.EqualsIgnoreCase(command, DataControlCommands.EditCommandName)) {
                    HandleEdit(); 
                } else if (StringUtil.EqualsIgnoreCase(command, DataControlCommands.UpdateCommandName)) {
                    HandleUpdate((string)dce.CommandArgument, causesValidation);
                } else if (StringUtil.EqualsIgnoreCase(command, DataControlCommands.CancelCommandName)) {
                    HandleCancel(); 
                } else if (StringUtil.EqualsIgnoreCase(command, DataControlCommands.DeleteCommandName)) {
                    HandleDelete((string)dce.CommandArgument); 
                } else if (StringUtil.EqualsIgnoreCase(command, DataControlCommands.InsertCommandName)) { 
                    HandleInsert((string)dce.CommandArgument, causesValidation);
                } else if (StringUtil.EqualsIgnoreCase(command, DataControlCommands.NewCommandName)) { 
                    HandleNew();
                }
            }
 
            return handled;
        } 
 
        private void HandleInsert(string commandArg, bool causesValidation) {
            if (causesValidation && Page != null && !Page.IsValid) { 
                return;
            }

            if (Mode != DetailsViewMode.Insert) { 
                throw new HttpException(SR.GetString(SR.DetailsViewFormView_ControlMustBeInInsertMode, "DetailsView", ID));
            } 
 
            DataSourceView view = null;
            bool isBoundToDataSourceControl = IsBoundUsingDataSourceID; 

            if (isBoundToDataSourceControl) {
                view = GetData();
                if (view == null) { 
                    throw new HttpException(SR.GetString(SR.View_DataSourceReturnedNullView, ID));
                } 
            } 

            DetailsViewInsertEventArgs e = new DetailsViewInsertEventArgs(commandArg); 

            if (isBoundToDataSourceControl) {
                ExtractRowValues(e.Values, false/*includeReadOnlyFields*/, true/*includePrimaryKey*/);
            } 

            OnItemInserting(e); 
 
            if (e.Cancel) {
                return; 
            }

            if (isBoundToDataSourceControl) {
                _insertValues = e.Values; 
                view.Insert(e.Values, HandleInsertCallback);
            } 
        } 

        private bool HandleInsertCallback(int affectedRows, Exception ex) { 
            DetailsViewInsertedEventArgs dea = new DetailsViewInsertedEventArgs(affectedRows, ex);
            dea.SetValues(_insertValues);
            OnItemInserted(dea);
 
            _insertValues = null;
            if (ex != null && !dea.ExceptionHandled) { 
                return false; 
            }
 
            if (!dea.KeepInInsertMode) {
                DetailsViewModeEventArgs eMode = new DetailsViewModeEventArgs(DefaultMode, false);
                OnModeChanging(eMode);
                if (!eMode.Cancel) { 
                    Mode = eMode.NewMode;
                    OnModeChanged(EventArgs.Empty); 
                    RequiresDataBinding = true; 
                }
            } 
            return true;
        }

        private void HandleNew() { 
            DetailsViewModeEventArgs e = new DetailsViewModeEventArgs(DetailsViewMode.Insert, false);
            OnModeChanging(e); 
 
            if (e.Cancel) {
                return; 
            }

            if (IsBoundUsingDataSourceID) {
                Mode = e.NewMode; 
                OnModeChanged(EventArgs.Empty);
            } 
 
            RequiresDataBinding = true;
        } 

        private void HandlePage(int newPage) {
            if (!AllowPaging) {
                return; 
            }
 
            if (PageIndex < 0) { 
                return;
            } 

            bool isBoundToDataSourceControl = IsBoundUsingDataSourceID;

            DetailsViewPageEventArgs e = new DetailsViewPageEventArgs(newPage); 
            OnPageIndexChanging(e);
 
            if (e.Cancel) { 
                return;
            } 

            if (isBoundToDataSourceControl) {
                _keyTable = null;
                if (e.NewPageIndex > -1) { 
                    // if the requested page is out of range and we're already on the last page, don't rebind
                    if ((e.NewPageIndex >= PageCount && _pageIndex == PageCount - 1)) { 
                        return; 
                    }
                    _pageIndex = e.NewPageIndex; 
                }
                else {
                    return;
                } 
            }
 
            OnPageIndexChanged(EventArgs.Empty); 
            RequiresDataBinding = true;
        } 

        private void HandleUpdate(string commandArg, bool causesValidation) {
            if (causesValidation && Page != null && !Page.IsValid) {
                return; 
            }
 
            if (Mode != DetailsViewMode.Edit) { 
                throw new HttpException(SR.GetString(SR.DetailsViewFormView_ControlMustBeInEditMode, "DetailsView", ID));
            } 

            if (PageIndex < 0) {
                return;
            } 

            DataSourceView view = null; 
            bool isBoundToDataSourceControl = IsBoundUsingDataSourceID; 

            if (isBoundToDataSourceControl) { 
                view = GetData();
                if (view == null) {
                    throw new HttpException(SR.GetString(SR.View_DataSourceReturnedNullView, ID));
                } 
            }
 
            DetailsViewUpdateEventArgs e = new DetailsViewUpdateEventArgs(commandArg); 

            if (isBoundToDataSourceControl) { 
                foreach (DictionaryEntry entry in BoundFieldValues) {
                    e.OldValues.Add(entry.Key, entry.Value);
                }
 
                ExtractRowValues(e.NewValues, false/*includeReadOnlyFields*/, true/*includePrimaryKey*/);
                foreach (DictionaryEntry entry in DataKey.Values) { 
                    e.Keys.Add(entry.Key, entry.Value); 
                }
 
            }

            OnItemUpdating(e);
 
            if (e.Cancel) {
                return; 
            } 

            if (isBoundToDataSourceControl) { 
                _updateKeys = e.Keys;
                _updateNewValues = e.NewValues;
                _updateOldValues = e.OldValues;
 
                view.Update(e.Keys, e.NewValues, e.OldValues, HandleUpdateCallback);
            } 
        } 

        private bool HandleUpdateCallback(int affectedRows, Exception ex) { 
            DetailsViewUpdatedEventArgs dea = new DetailsViewUpdatedEventArgs(affectedRows, ex);
            dea.SetOldValues(_updateOldValues);
            dea.SetNewValues(_updateNewValues);
            dea.SetKeys(_updateKeys); 

            OnItemUpdated(dea); 
 
            _updateKeys = null;
            _updateOldValues = null; 
            _updateNewValues = null;

            if (ex != null && !dea.ExceptionHandled) {
                return false; 
            }
 
            if (!dea.KeepInEditMode) { 
                DetailsViewModeEventArgs eMode = new DetailsViewModeEventArgs(DefaultMode, false);
                OnModeChanging(eMode); 
                if (!eMode.Cancel) {
                    Mode = eMode.NewMode;
                    OnModeChanged(EventArgs.Empty);
                    RequiresDataBinding = true; 
                }
            } 
            return true; 
        }
 

        /// 
        /// 
        /// Creates a DetailsViewRow that contains the paging UI. 
        /// The paging UI is a navigation bar that is a built into a single TableCell that
        /// spans across all fields of the DetailsView. 
        ///  
        /// 
        protected virtual void InitializePager(DetailsViewRow row, PagedDataSource pagedDataSource) { 
            TableCell cell = new TableCell();

            PagerSettings pagerSettings = PagerSettings;
 
            if (_pagerTemplate != null) {
                _pagerTemplate.InstantiateIn(cell); 
            } 
            else {
                PagerTable pagerTable = new PagerTable(); 
                TableRow pagerTableRow = new TableRow();
                cell.Controls.Add(pagerTable);
                pagerTable.Rows.Add(pagerTableRow);
                switch (pagerSettings.Mode) { 
                    case PagerButtons.NextPrevious:
                        CreateNextPrevPager(pagerTableRow, pagedDataSource, false); 
                        break; 
                    case PagerButtons.Numeric:
                        CreateNumericPager(pagerTableRow, pagedDataSource, false); 
                        break;
                    case PagerButtons.NextPreviousFirstLast:
                        CreateNextPrevPager(pagerTableRow, pagedDataSource, true);
                        break; 
                    case PagerButtons.NumericFirstLast:
                        CreateNumericPager(pagerTableRow, pagedDataSource, true); 
                        break; 
                }
            } 
            cell.ColumnSpan = 2;
            row.Cells.Add(cell);
        }
 

 
        ///  
        /// [To be supplied.]
        ///  
        protected virtual void InitializeRow(DetailsViewRow row, DataControlField field) {
            TableCellCollection cells = row.Cells;
            DataControlFieldCell contentCell = new DataControlFieldCell(field);
            ITemplate contentTemplate = null; 
            int itemIndex = DataItemIndex;
            DataControlRowState rowState = row.RowState; 
 
            switch (row.RowType) {
                case DataControlRowType.DataRow: 
                    if (field.ShowHeader) {
                        DataControlFieldCell headerTextCell = new DataControlFieldCell(field);
                        field.InitializeCell(headerTextCell, DataControlCellType.Header, rowState, itemIndex);
                        cells.Add(headerTextCell); 
                    }
                    else { 
                        contentCell.ColumnSpan = 2; 
                    }
                    field.InitializeCell(contentCell, DataControlCellType.DataCell, rowState, itemIndex); 
                    break;
                case DataControlRowType.Header:
                    contentTemplate = _headerTemplate;
                    contentCell.ColumnSpan = 2; 
                    string headerText = HeaderText;
                    if (_headerTemplate == null && headerText.Length > 0) { 
                        contentCell.Text = headerText; 
                    }
                    break; 
                case DataControlRowType.Footer:
                    contentTemplate = _footerTemplate;
                    contentCell.ColumnSpan = 2;
                    string footerText = FooterText; 
                    if (_footerTemplate == null && footerText.Length > 0) {
                        contentCell.Text = footerText; 
                    } 
                    break;
                case DataControlRowType.EmptyDataRow: 
                    contentTemplate = _emptyDataTemplate;
                    string emptyDataText = EmptyDataText;
                    if (_emptyDataTemplate == null && emptyDataText.Length > 0) {
                        contentCell.Text = emptyDataText; 
                    }
                    break; 
            } 

            if (contentTemplate != null) { 
                contentTemplate.InstantiateIn(contentCell);
            }
            cells.Add(contentCell);
        } 

        public virtual void InsertItem(bool causesValidation) { 
            HandleInsert(String.Empty, causesValidation); 
        }
 

        /// 
        /// Determines if the specified data type can be bound to.
        ///  
        public virtual bool IsBindableType(Type type) {
            return DataBoundControlHelper.IsBindableType(type); 
        } 

 
        /// 
        /// Loads the control state for those properties that should persist across postbacks
        ///   even when EnableViewState=false.
        ///  
        protected internal override void LoadControlState(object savedState) {
            // Any properties that could have been set in the persistance need to be 
            // restored to their defaults if they're not in ControlState, or they will 
            // be restored to their persisted state instead of their empty state.
            _pageIndex = 0; 
            _defaultMode = DetailsViewMode.ReadOnly;
            _dataKeyNames = new string[0];
            _pageCount = 0;
 
            object[] state = savedState as object[];
 
            if (state != null) { 
                base.LoadControlState(state[0]);
                if (state[1] != null) { 
                    _pageIndex = (int)state[1];
                }

                if (state[2] != null) { 
                    _defaultMode = (DetailsViewMode)state[2];
                } 
 
                // if Mode isn't saved, it should be restored to DefaultMode.  That will happen in Mode's getter,
                // since the persistance state hasn't been loaded yet. 
                if (state[3] != null) {
                    Mode = (DetailsViewMode)state[3];
                }
 
                if (state[4] != null) {
                    _dataKeyNames = (string[])state[4]; 
                } 

                if (state[5] != null) { 
                    OrderedDictionaryStateHelper.LoadViewState((OrderedDictionary)KeyTable, (ArrayList)state[5]);
                }

                if (state[6] != null) { 
                    _pageCount = (int)state[6];
                } 
            } 
            else {
                base.LoadControlState(null); 
            }

        }
 
        private bool LoadHiddenFieldState(string pageIndex, string dataKey) {
            bool propertyChanged = false; 
            int oldPageIndex = Int32.Parse(pageIndex, CultureInfo.InvariantCulture); 

            if (PageIndex != oldPageIndex) { 
                propertyChanged = true;

                // since we can't go into insert mode in a callback, oldPageIndex should never be -1 and different from PageIndex
                Debug.Assert(oldPageIndex >= 0, "Page indeces are out of sync from callback hidden field state"); 
                _pageIndex = oldPageIndex;
 
                string oldDataKeyString = dataKey; 

                if (!String.IsNullOrEmpty(oldDataKeyString)) { 
                    IStateFormatter formatter = Page.CreateStateFormatter();
                    ArrayList oldDataKeyState = formatter.Deserialize(oldDataKeyString) as ArrayList;
                    if (_keyTable != null) {
                        _keyTable.Clear(); 
                    }
                    OrderedDictionaryStateHelper.LoadViewState(KeyTable, oldDataKeyState); 
                } 
            }
            return propertyChanged; 
        }


        ///  
        /// Loads a saved state of the .
        ///  
        protected override void LoadViewState(object savedState) { 
            if (savedState != null) {
                object[] myState = (object[])savedState; 

                base.LoadViewState(myState[0]);
                if (myState[1] != null)
                    ((IStateManager)PagerStyle).LoadViewState(myState[1]); 
                if (myState[2] != null)
                    ((IStateManager)HeaderStyle).LoadViewState(myState[2]); 
                if (myState[3] != null) 
                    ((IStateManager)FooterStyle).LoadViewState(myState[3]);
                if (myState[4] != null) 
                    ((IStateManager)RowStyle).LoadViewState(myState[4]);
                if (myState[5] != null)
                    ((IStateManager)AlternatingRowStyle).LoadViewState(myState[5]);
                if (myState[6] != null) 
                    ((IStateManager)CommandRowStyle).LoadViewState(myState[6]);
                if (myState[7] != null) 
                    ((IStateManager)EditRowStyle).LoadViewState(myState[7]); 
                if (myState[8] != null)
                    ((IStateManager)InsertRowStyle).LoadViewState(myState[8]); 
                if (myState[9] != null)
                    ((IStateManager)FieldHeaderStyle).LoadViewState(myState[9]);
                if (myState[10] != null)
                    ((IStateManager)Fields).LoadViewState(myState[10]); 
                if (myState[11] != null)
                    OrderedDictionaryStateHelper.LoadViewState((OrderedDictionary)BoundFieldValues, (ArrayList)myState[11]); 
                if (myState[12] != null) 
                    ((IStateManager)PagerSettings).LoadViewState(myState[12]);
                if (myState[13] != null) 
                    ((IStateManager)ControlStyle).LoadViewState(myState[13]);
                if (myState[14] != null) {
                    object[] autoGenFieldStateArray = (object[])myState[14];
                    int fieldCount = autoGenFieldStateArray.Length; 

                    _autoGenFieldProps = new ArrayList(); 
 
                    for (int i = 0; i < fieldCount; i++) {
                        AutoGeneratedFieldProperties fieldProps = new AutoGeneratedFieldProperties(); 

                        ((IStateManager)fieldProps).TrackViewState();
                        ((IStateManager)fieldProps).LoadViewState(autoGenFieldStateArray[i]);
 
                        _autoGenFieldProps.Add(fieldProps);
                    } 
                } 
            }
            else { 
                base.LoadViewState(null);
            }
        }
 

        ///  
        ///  
        protected override bool OnBubbleEvent(object source, EventArgs e) {
            bool causesValidation = false; 
            string validationGroup = String.Empty;

            DetailsViewCommandEventArgs dvcea = e as DetailsViewCommandEventArgs;
            if (dvcea != null) { 
                IButtonControl button = dvcea.CommandSource as IButtonControl;
                if (button != null) { 
                    causesValidation = button.CausesValidation; 
                    validationGroup = button.ValidationGroup;
                } 
            }
            return HandleEvent(e, causesValidation, validationGroup);
        }
 
        protected override void OnDataSourceViewChanged(object sender, EventArgs e) {
            _keyTable = null; 
            base.OnDataSourceViewChanged(sender, e); 
        }
 
        private void OnFieldsChanged(object sender, EventArgs e) {
            if (Initialized) {
                RequiresDataBinding = true;
            } 
        }
 
 
        /// 
        /// DetailsView initialization. 
        /// 
        protected internal override void OnInit(EventArgs e) {
            base.OnInit(e);
            if (Page != null) { 
                if (DataKeyNames.Length > 0 && !AutoGenerateRows) {
                    Page.RegisterRequiresViewStateEncryption(); 
                } 
                Page.RegisterRequiresControlState(this);
            } 
        }


        ///  
        /// Raises the  event.
        ///  
        protected virtual void OnItemCommand(DetailsViewCommandEventArgs e) { 
            DetailsViewCommandEventHandler handler = (DetailsViewCommandEventHandler)Events[EventItemCommand];
            if (handler != null) { 
                handler(this, e);
            }
        }
 

        ///  
        /// Raises the  event. 
        /// 
        protected virtual void OnItemCreated(EventArgs e) { 
            EventHandler handler = (EventHandler)Events[EventItemCreated];
            if (handler != null) {
                handler(this, e);
            } 
        }
 
 
        /// 
        /// Raises the event. 
        /// 
        protected virtual void OnItemDeleted(DetailsViewDeletedEventArgs e) {
            DetailsViewDeletedEventHandler handler = (DetailsViewDeletedEventHandler)Events[EventItemDeleted];
            if (handler != null) handler(this, e); 
        }
 
 
        /// 
        /// Raises the  event. 
        /// 
        protected virtual void OnItemDeleting(DetailsViewDeleteEventArgs e) {
            bool isBoundToDataSourceControl = IsBoundUsingDataSourceID;
 
            DetailsViewDeleteEventHandler handler = (DetailsViewDeleteEventHandler)Events[EventItemDeleting];
            if (handler != null) { 
                handler(this, e); 
            } else {
                if (isBoundToDataSourceControl == false && e.Cancel == false) { 
                    throw new HttpException(SR.GetString(SR.DetailsView_UnhandledEvent, ID, "ItemDeleting"));
                }
            }
        } 

 
        ///  
        /// Raises the event.
        ///  
        protected virtual void OnItemInserted(DetailsViewInsertedEventArgs e) {
            DetailsViewInsertedEventHandler handler = (DetailsViewInsertedEventHandler)Events[EventItemInserted];
            if (handler != null) handler(this, e);
        } 

 
        ///  
        /// Raises the  event.
        ///  
        protected virtual void OnItemInserting(DetailsViewInsertEventArgs e) {
            bool isBoundToDataSourceControl = IsBoundUsingDataSourceID;

            DetailsViewInsertEventHandler handler = (DetailsViewInsertEventHandler)Events[EventItemInserting]; 
            if (handler != null) {
                handler(this, e); 
            } else { 
                if (isBoundToDataSourceControl == false && e.Cancel == false) {
                    throw new HttpException(SR.GetString(SR.DetailsView_UnhandledEvent, ID, "ItemInserting")); 
                }
            }
        }
 

        ///  
        /// Raises the event. 
        /// 
        protected virtual void OnItemUpdated(DetailsViewUpdatedEventArgs e) { 
            DetailsViewUpdatedEventHandler handler = (DetailsViewUpdatedEventHandler)Events[EventItemUpdated];
            if (handler != null) handler(this, e);
        }
 

        ///  
        /// Raises the  event. 
        /// 
        protected virtual void OnItemUpdating(DetailsViewUpdateEventArgs e) { 
            bool isBoundToDataSourceControl = IsBoundUsingDataSourceID;

            DetailsViewUpdateEventHandler handler = (DetailsViewUpdateEventHandler)Events[EventItemUpdating];
            if (handler != null) { 
                handler(this, e);
            } else { 
                if (isBoundToDataSourceControl == false && e.Cancel == false) { 
                    throw new HttpException(SR.GetString(SR.DetailsView_UnhandledEvent, ID, "ItemUpdating"));
                } 
            }
        }

 
        /// 
        /// Raises the event. 
        ///  
        protected virtual void OnModeChanged(EventArgs e) {
            EventHandler handler = (EventHandler)Events[EventModeChanged]; 
            if (handler != null) handler(this, e);
        }

 
        /// 
        /// Raises the  event. 
        ///  
        protected virtual void OnModeChanging(DetailsViewModeEventArgs e) {
            bool isBoundToDataSourceControl = IsBoundUsingDataSourceID; 

            DetailsViewModeEventHandler handler = (DetailsViewModeEventHandler)Events[EventModeChanging];
            if (handler != null) {
                handler(this, e); 
            } else {
                if (isBoundToDataSourceControl == false && e.Cancel == false) { 
                    throw new HttpException(SR.GetString(SR.DetailsView_UnhandledEvent, ID, "ModeChanging")); 
                }
            } 
        }

        /// 
        /// Raises the event. 
        /// 
        protected virtual void OnPageIndexChanged(EventArgs e) { 
            EventHandler handler = (EventHandler)Events[EventPageIndexChanged]; 
            if (handler != null) handler(this, e);
        } 


        /// 
        /// Raises the  event. 
        /// 
        protected virtual void OnPageIndexChanging(DetailsViewPageEventArgs e) { 
            bool isBoundToDataSourceControl = IsBoundUsingDataSourceID; 

            DetailsViewPageEventHandler handler = (DetailsViewPageEventHandler)Events[EventPageIndexChanging]; 
            if (handler != null) {
                handler(this, e);
            } else {
                if (isBoundToDataSourceControl == false && e.Cancel == false) { 
                    throw new HttpException(SR.GetString(SR.DetailsView_UnhandledEvent, ID, "PageIndexChanging"));
                } 
            } 
        }
 
        protected override void OnPagePreLoad(object sender, EventArgs e) {
            // Load hidden field state here to overwrite control state properties.  LoadViewState and LoadControlState
            // may not get called if there's no state in them.  We should allow the user to
            // set EnablePagingCallbacks in Page_Load, so don't request from DetermineRenderClientScript here. 
            if (Page != null && !Page.IsCallback && Page.RequestValueCollection != null) {
                string hiddenFieldID = "__dv" + ClientID + "__hidden"; 
                string hiddenFieldState = Page.RequestValueCollection[hiddenFieldID]; 
                if (!String.IsNullOrEmpty(hiddenFieldState)) {
                    if (ParseHiddenFieldState(hiddenFieldState)) { 
                        RequiresDataBinding = true;
                    }
                }
            } 

            base.OnPagePreLoad(sender, e); 
        } 

        private void OnPagerPropertyChanged(object sender, EventArgs e) { 
            if (Initialized) {
                RequiresDataBinding = true;
            }
        } 

        private const string startupScriptFormat = @" 
var {0} = new DetailsView(); 
{0}.stateField = document.getElementById('{1}');
{0}.panelElement = document.getElementById('{0}__div'); 
{0}.pageIndex = {3};
{0}.setStateField();
{0}.callback = function(arg) {{
    {2}; 
}};";
 
        ///  
        /// Sets up the callback scripts if client script is supported on the client
        ///  
        protected internal override void OnPreRender(EventArgs e) {
            base.OnPreRender(e);
            if (DetermineRenderClientScript() && Page != null) {
                string clientReference = "__dv" + ClientID; 
                ClientScriptManager scriptOM = Page.ClientScript;
 
                scriptOM.RegisterClientScriptResource(typeof(DetailsView), "DetailsView.js"); 

                // The return value of GetCallbackEventReference looks like this: 
                // "__doCallBack(controlname, script fx that returns arg, "DetailsView_OnCallback, context, errorMethod)"
                string doCallBackCall = scriptOM.GetCallbackEventReference(this, clientReference + ".getHiddenFieldContents(arg)", "DetailsView_OnCallback", clientReference);

                // Hidden field used to post content from DetailsView 
                // back to the server
                string hiddenFieldID = clientReference + "__hidden"; 
                scriptOM.RegisterHiddenField(hiddenFieldID, String.Empty); 

                string startupScript = String.Format(CultureInfo.InvariantCulture, startupScriptFormat, clientReference, hiddenFieldID, doCallBackCall, PageIndex); 
                scriptOM.RegisterStartupScript(typeof(DetailsView), clientReference, startupScript, true);
            }
        }
 
        /// 
        /// Parses the information in the hidden field for callbacks and sets members to the values 
        ///    in the hidden field.  Returns whether properties changed from what was retrieved from controlstate. 
        /// 
        private bool ParseHiddenFieldState(string state) { 
            string[] arguments = state.Split(new char[] {'|'});
            if (arguments.Length == 2) {
                return LoadHiddenFieldState(arguments[0], arguments[1]);
            } 
            return false;
        } 
 

        protected internal override void PerformDataBinding(IEnumerable data) { 
            base.PerformDataBinding(data);
            if (IsBoundUsingDataSourceID && Mode == DetailsViewMode.Edit && IsViewStateEnabled) {
                BoundFieldValues.Clear();
                ExtractRowValues(BoundFieldValues, true/*includeReadOnlyFields*/, false/*includePrimaryKey*/); 
            }
        } 
 
        /// 
        ///  
        protected internal virtual void PrepareControlHierarchy() {
            // The order of rows is autogenerated data rows, declared rows, then autogenerated command rows
            if (Controls.Count < 1) {
                return; 
            }
 
            Debug.Assert(Controls[0] is Table); 

            Table childTable = (Table)Controls[0]; 
            childTable.CopyBaseAttributes(this);
            if (ControlStyleCreated && !ControlStyle.IsEmpty) {
                childTable.ApplyStyle(ControlStyle);
            } else { 
                // Since we didn't create a ControlStyle yet, the default
                // settings for the default style of the control need to be applied 
                // to the child table control directly 
                //
 
                childTable.GridLines = GridLines.Both;
                childTable.CellSpacing = 0;
            }
            childTable.Caption = Caption; 
            childTable.CaptionAlign = CaptionAlign;
 
            // the composite alternating item style, so we need to do just one 
            // merge style on the actual item
            Style altRowStyle = new TableItemStyle(); 
            altRowStyle.CopyFrom(_rowStyle);
            if (_alternatingRowStyle != null) {
                altRowStyle = new TableItemStyle();
                altRowStyle.CopyFrom(_alternatingRowStyle); 
            }
 
            Style compositeStyle; 

            TableRowCollection rows = childTable.Rows; 

            foreach (DetailsViewRow row in rows) {
                compositeStyle = new TableItemStyle();
                DataControlRowState rowState = row.RowState; 
                DataControlRowType rowType = row.RowType;
                DataControlFieldCell headerFieldCell = row.Cells[0] as DataControlFieldCell; 
                DataControlField field = null; 

                if (headerFieldCell != null) { 
                    field = headerFieldCell.ContainingField;
                }

                switch (rowType) { 
                    case DataControlRowType.Header:
                        compositeStyle = _headerStyle; 
                        break; 

                    case DataControlRowType.Footer: 
                        compositeStyle = _footerStyle;
                        break;

                    case DataControlRowType.DataRow: 
                        compositeStyle.CopyFrom(_rowStyle);
 
 
                        if ((rowState & DataControlRowState.Alternate) != 0) {
                            compositeStyle.CopyFrom(altRowStyle); 
                        }
                        if (field is ButtonFieldBase) {
                            compositeStyle.CopyFrom(_commandRowStyle);
                            break; 
                        }
                        if ((rowState & DataControlRowState.Edit) != 0) { 
                            compositeStyle.CopyFrom(_editRowStyle); 
                        }
                        if ((rowState & DataControlRowState.Insert) != 0) { 
                            if (_insertRowStyle != null) {
                                compositeStyle.CopyFrom(_insertRowStyle);
                            }
                            else { 
                                compositeStyle.CopyFrom(_editRowStyle);
                            } 
                        } 
                        break;
 
                    case DataControlRowType.Pager:
                        compositeStyle = _pagerStyle;
                        break;
                    case DataControlRowType.EmptyDataRow: 
                        compositeStyle = _emptyDataRowStyle;
                        break; 
                } 

                if (compositeStyle != null && row.Visible) { 
                    row.MergeStyle(compositeStyle);
                }

                if (rowType == DataControlRowType.DataRow && field != null) { 
                    if (!field.Visible ||
                        (Mode == DetailsViewMode.Insert &&  !field.InsertVisible)) { 
                        row.Visible = false; 
                    }
                    else { 
                        int contentCellIndex = 0;
                        DataControlFieldCell contentFieldCell = null;

                        if (headerFieldCell != null && headerFieldCell.ContainingField.ShowHeader) { 
                            headerFieldCell.MergeStyle(field.HeaderStyleInternal);
                            headerFieldCell.MergeStyle(_fieldHeaderStyle); 
                            contentCellIndex = 1; 
                        }
                        contentFieldCell = row.Cells[contentCellIndex] as DataControlFieldCell; 
                        if (contentFieldCell != null) {
                            contentFieldCell.MergeStyle(field.ItemStyleInternal);
                        }
 
                        foreach (Control control in contentFieldCell.Controls) {
                            WebControl webControl = control as WebControl; 
                            Style fieldControlStyle = field.ControlStyleInternal; 
                            if (webControl != null && fieldControlStyle != null && !fieldControlStyle.IsEmpty) {
                                webControl.ControlStyle.CopyFrom(fieldControlStyle); 
                            }
                        }
                    }
                } 
            }
        } 
 
        protected virtual void RaiseCallbackEvent(string eventArgument) {
            string[] arguments = eventArgument.Split(new char[] {'|'}); 
            Debug.Assert((arguments != null && (arguments.Length == 4)), "An unexpected number of params came through");

            ValidateEvent(UniqueID, "\"" + arguments[0] + "|" + arguments[1] + "\"");
 
            LoadHiddenFieldState(arguments[2], arguments[3]);
 
            int pageNumber = Int32.Parse(arguments[0], CultureInfo.InvariantCulture); 
            _pageIndex = pageNumber;
 
            DataBind();
        }

        protected virtual void RaisePostBackEvent(string eventArgument) { 
            ValidateEvent(UniqueID, eventArgument);
 
            int separatorIndex = eventArgument.IndexOf('$'); 
            if (separatorIndex < 0) {
                return; 
            }

            CommandEventArgs cea = new CommandEventArgs(eventArgument.Substring(0, separatorIndex), eventArgument.Substring(separatorIndex + 1));
 
            DetailsViewCommandEventArgs dvcea = new DetailsViewCommandEventArgs(this, cea);
            HandleEvent(dvcea, false, String.Empty); 
 		} 

 
        /// 
        /// Displays the control on the client.
        /// 
        protected internal override void Render(HtmlTextWriter writer) { 
            // we don't render the outer div at design time because the designer surface
            // needs a top-level layout element 
            Render(writer, !DesignMode); 
        }
 
        private void Render(HtmlTextWriter writer, bool renderPanel) {
            if (Page != null) {
                Page.VerifyRenderingInServerForm(this);
            } 
            PrepareControlHierarchy();
            if (renderPanel) { 
                if (DetermineRenderClientScript()) { 
                    string clientID = ClientID;
                    if (clientID == null) { 
                        throw new HttpException(SR.GetString(SR.DetailsView_MustBeParented));
                    }
                    else {
                        StringBuilder clientPanelNameBuilder = new StringBuilder("__dv", 9 + clientID.Length); 
                        clientPanelNameBuilder.Append(clientID);
                        clientPanelNameBuilder.Append("__div"); 
                        writer.AddAttribute(HtmlTextWriterAttribute.Id, clientPanelNameBuilder.ToString(), true); 
                    }
                } 
                writer.RenderBeginTag(HtmlTextWriterTag.Div);
            }
            RenderContents(writer);
            if (renderPanel) { 
                writer.RenderEndTag();
            } 
        } 

        private void RenderTableContents(HtmlTextWriter writer) { 
            Render(writer, false);
        }

 
        /// 
        /// Saves the control state for those properties that should persist across postbacks 
        ///   even when EnableViewState=false. 
        /// 
        protected internal override object SaveControlState() { 
            object baseState = base.SaveControlState();
            // LoadControlState won't get called if SaveControlState returned null.  We need to restore
            // values that are defaults but different from declarative property sets.
            if (baseState != null || 
                _pageIndex != 0 ||
                _mode != _defaultMode || 
                _defaultMode != DetailsViewMode.ReadOnly || 
                (_dataKeyNames != null && _dataKeyNames.Length > 0) ||
                (_keyTable != null && _keyTable.Count > 0) || 
                _pageCount != 0) {

                object[] state = new object[7];
                object pageIndexState = null; 
                object modeState = null;
                object defaultModeState = null; 
                object keyNamesState = null; 
                object keyTableState = null;
                object pageCountState = null; 

                if (_pageIndex != 0) {
                    pageIndexState = _pageIndex;
                } 
                if (_defaultMode != DetailsViewMode.ReadOnly) {
                    defaultModeState = (int)_defaultMode; 
                } 
                // Only save the mode if it's different from the DefaultMode.  Otherwise, the Mode
                // getter will restore it to the DefaultMode value. 
                if (_mode != _defaultMode && _modeSet) {
                    modeState = (int)_mode;
                }
 
                if (_dataKeyNames != null && _dataKeyNames.Length > 0) {
                    keyNamesState = _dataKeyNames; 
                } 

                if (_keyTable != null) { 
                    keyTableState = OrderedDictionaryStateHelper.SaveViewState(_keyTable);
                }

                if (_pageCount != 0) { 
                    pageCountState = _pageCount;
                } 
 
                state[0] = baseState;
                state[1] = pageIndexState; 
                state[2] = defaultModeState;
                state[3] = modeState;
                state[4] = keyNamesState;
                state[5] = keyTableState; 
                state[6] = pageCountState;
 
                return state; 
            }
            return true;    // return a dummy that ensures LoadControlState gets called but minimizes persisted size. 
        }


        ///  
        /// Saves the current state of the .
        ///  
        protected override object SaveViewState() { 
            object baseState = base.SaveViewState();
            object pagerStyleState = (_pagerStyle != null) ? ((IStateManager)_pagerStyle).SaveViewState() : null; 
            object headerStyleState = (_headerStyle != null) ? ((IStateManager)_headerStyle).SaveViewState() : null;
            object footerStyleState = (_footerStyle != null) ? ((IStateManager)_footerStyle).SaveViewState() : null;
            object rowStyleState = (_rowStyle != null) ? ((IStateManager)_rowStyle).SaveViewState() : null;
            object alternatingRowStyleState = (_alternatingRowStyle != null) ? ((IStateManager)_alternatingRowStyle).SaveViewState() : null; 
            object commandRowStyleState = (_commandRowStyle != null) ? ((IStateManager)_commandRowStyle).SaveViewState() : null;
            object editRowStyleState = (_editRowStyle != null) ? ((IStateManager)_editRowStyle).SaveViewState() : null; 
            object insertRowStyleState = (_insertRowStyle != null) ? ((IStateManager)_insertRowStyle).SaveViewState() : null; 
            object fieldHeaderStyleState = (_fieldHeaderStyle != null) ? ((IStateManager)_fieldHeaderStyle).SaveViewState() : null;
            object fieldsState = (_fieldCollection != null) ? ((IStateManager)_fieldCollection).SaveViewState() : null; 
            object boundFieldValuesState = (_boundFieldValues != null) ? OrderedDictionaryStateHelper.SaveViewState(_boundFieldValues) : null;
            object pagerSettingsState = (_pagerSettings != null) ? ((IStateManager)_pagerSettings).SaveViewState() : null;
            object controlState = ControlStyleCreated ? ((IStateManager)ControlStyle).SaveViewState() : null;
 
            object autoGenFieldState = null;
            if (_autoGenFieldProps != null) { 
                int autoGenFieldPropsCount = _autoGenFieldProps.Count; 
                object[] o = new object[autoGenFieldPropsCount];
 
                for (int i = 0; i < autoGenFieldPropsCount; i++) {
                    o[i] = ((IStateManager)_autoGenFieldProps[i]).SaveViewState();
                }
                autoGenFieldState = o; 
            }
 
            object[] myState = new object[15]; 
            myState[0] = baseState;
            myState[1] = pagerStyleState; 
            myState[2] = headerStyleState;
            myState[3] = footerStyleState;
            myState[4] = rowStyleState;
            myState[5] = alternatingRowStyleState; 
            myState[6] = commandRowStyleState;
            myState[7] = editRowStyleState; 
            myState[8] = insertRowStyleState; 
            myState[9] = fieldHeaderStyleState;
            myState[10] = fieldsState; 
            myState[11] = boundFieldValuesState;
            myState[12] = pagerSettingsState;
            myState[13] = controlState;
            myState[14] = autoGenFieldState; 

            // note that we always have some state, atleast the RowCount 
            return myState; 
        }
 
        private void SelectCallback(IEnumerable data) {
            // The data source should have thrown.  If we're here, it didn't.  We'll throw for it
            // with a generic message.
            throw new HttpException(SR.GetString(SR.DataBoundControl_DataSourceDoesntSupportPaging)); 
        }
 
        ///  
        /// Marks the starting point to begin tracking and saving changes to the
        /// control as part of the control viewstate. 
        /// 
        protected override void TrackViewState() {
            base.TrackViewState();
 
            if (_fieldCollection != null)
                ((IStateManager)_fieldCollection).TrackViewState(); 
            if (_pagerStyle != null) 
                ((IStateManager)_pagerStyle).TrackViewState();
            if (_headerStyle != null) 
                ((IStateManager)_headerStyle).TrackViewState();
            if (_footerStyle != null)
                ((IStateManager)_footerStyle).TrackViewState();
            if (_rowStyle != null) 
                ((IStateManager)_rowStyle).TrackViewState();
            if (_alternatingRowStyle != null) 
                ((IStateManager)_alternatingRowStyle).TrackViewState(); 
            if (_commandRowStyle != null)
                ((IStateManager)_commandRowStyle).TrackViewState(); 
            if (_editRowStyle != null)
                ((IStateManager)_editRowStyle).TrackViewState();
            if (_insertRowStyle != null)
                ((IStateManager)_insertRowStyle).TrackViewState(); 
            if (_pagerSettings != null)
                ((IStateManager)_pagerSettings).TrackViewState(); 
            if (ControlStyleCreated) 
                ((IStateManager)ControlStyle).TrackViewState();
        } 

        public virtual void UpdateItem(bool causesValidation) {
            HandleUpdate(String.Empty, causesValidation);
        } 

        #region IPostBackEventHandler implementation 
        void IPostBackEventHandler.RaisePostBackEvent(string eventArgument) { 
            RaisePostBackEvent(eventArgument);
        } 
        #endregion

        #region IPostBackContainer implementation
        PostBackOptions IPostBackContainer.GetPostBackOptions(IButtonControl buttonControl) { 
            if (buttonControl == null) {
                throw new ArgumentNullException("buttonControl"); 
            } 

            if (buttonControl.CausesValidation) { 
                throw new InvalidOperationException(SR.GetString(SR.CannotUseParentPostBackWhenValidating, this.GetType().Name, ID));
            }

            PostBackOptions options = new PostBackOptions(this, (buttonControl.CommandName + "$" + buttonControl.CommandArgument)); 
            options.RequiresJavaScriptProtocol = true;
 
            return options; 
        }
        #endregion 

        #region ICallbackContainer implementation
        string ICallbackContainer.GetCallbackScript(IButtonControl buttonControl, string argument) {
            return GetCallbackScript(buttonControl, argument); 
        }
        #endregion 
 
        #region ICallbackEventHandler implementation
        void ICallbackEventHandler.RaiseCallbackEvent(string eventArgument) { 
            RaiseCallbackEvent(eventArgument);
        }

        // The return value of this function is the argument to the callback handler in 
        // GetCallbackEventReference.
        string ICallbackEventHandler.GetCallbackResult() { 
            return GetCallbackResult(); 
        }
        #endregion 

        #region IDataItemContainer implementation
        int IDataItemContainer.DataItemIndex {
            get { 
                return DataItemIndex;
            } 
        } 

        int IDataItemContainer.DisplayIndex { 
            get {
                return 0;
            }
        } 
        #endregion
    } 
}
                        

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