RequiredFieldValidator.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / RequiredFieldValidator.cs / 1305376 / RequiredFieldValidator.cs
                        

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

/* 
 */ 

namespace System.Web.UI.WebControls { 

    using System.ComponentModel;
    using System.Web;
    using System.Web.Util; 

 
    ///  
    ///     Checks if the value of
    ///       the associated input control is different from its initial value. 
    /// 
    [
    ToolboxData("<{0}:RequiredFieldValidator runat=\"server\" ErrorMessage=\"RequiredFieldValidator\">")
    ] 
    public class RequiredFieldValidator : BaseValidator {
 
 
        /// 
        ///    Gets or sets the initial value of the associated input control. 
        /// 
        [
        WebCategory("Behavior"),
        Themeable(false), 
        DefaultValue(""),
        WebSysDescription(SR.RequiredFieldValidator_InitialValue) 
        ] 
        public string InitialValue {
            get { 
                object o = ViewState["InitialValue"];
                return((o == null) ? String.Empty : (string)o);
            }
            set { 
                ViewState["InitialValue"] = value;
            } 
        } 

 
        /// 
        /// 
        ///    AddAttributesToRender method
        ///  
        protected override void AddAttributesToRender(HtmlTextWriter writer) {
            base.AddAttributesToRender(writer); 
            if (RenderUplevel) { 
                string id = ClientID;
                HtmlTextWriter expandoAttributeWriter = (EnableLegacyRendering) ? writer : null; 
                AddExpandoAttribute(expandoAttributeWriter, id, "evaluationfunction", "RequiredFieldValidatorEvaluateIsValid", false);
                AddExpandoAttribute(expandoAttributeWriter, id, "initialvalue", InitialValue);
            }
        } 

 
        ///  
        /// 
        ///    EvaluateIsValid method 
        /// 
        protected override bool EvaluateIsValid() {

            // Get the control value, return true if it is not found 
            string controlValue = GetControlValidationValue(ControlToValidate);
            if (controlValue == null) { 
                Debug.Fail("Should have been caught by PropertiesValid check"); 
                return true;
            } 

            // See if the control has changed
            return(!controlValue.Trim().Equals(InitialValue.Trim()));
        } 
    }
} 
 

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

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