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//------------------------------------------------------------------------------
// <copyright file="RequiredFieldValidator.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
/*
*/
namespace System.Web.UI.WebControls {
using System.ComponentModel;
using System.Web;
using System.Web.Util;
/// <devdoc>
/// <para> Checks if the value of
/// the associated input control is different from its initial value.</para>
/// </devdoc>
[
ToolboxData("<{0}:RequiredFieldValidator runat=\"server\" ErrorMessage=\"RequiredFieldValidator\"></{0}:RequiredFieldValidator>")
]
public class RequiredFieldValidator : BaseValidator {
/// <devdoc>
/// <para>Gets or sets the initial value of the associated input control.</para>
/// </devdoc>
[
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;
}
}
/// <internalonly/>
/// <devdoc>
/// AddAttributesToRender method
/// </devdoc>
protected override void AddAttributesToRender(HtmlTextWriter writer) {
base.AddAttributesToRender(writer);
if (RenderUplevel) {
string id = ClientID;
HtmlTextWriter expandoAttributeWriter = (EnableLegacyRendering || IsUnobtrusive) ? writer : null;
AddExpandoAttribute(expandoAttributeWriter, id, "evaluationfunction", "RequiredFieldValidatorEvaluateIsValid", false);
AddExpandoAttribute(expandoAttributeWriter, id, "initialvalue", InitialValue);
}
}
/// <internalonly/>
/// <devdoc>
/// EvaluateIsValid method
/// </devdoc>
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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