RequiredFieldValidator.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / RequiredFieldValidator.cs / 1 / RequiredFieldValidator.cs
                        

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

/* 
 */ 

namespace System.Web.UI.WebControls { 

    using System.ComponentModel;
    using System.Web;
    using System.Security.Permissions; 
    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\">") 
    ]
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    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())); 
        } 
    }
}

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