CompareValidator.ValueToCompare Property

Gets or sets a constant value to compare with the value entered by the user in the input control being validated.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)

public string ValueToCompare { get; set; }
/** @property */
public String get_ValueToCompare ()

/** @property */
public void set_ValueToCompare (String value)

public function get ValueToCompare () : String

public function set ValueToCompare (value : String)

Not applicable.

Property Value

The constant value to compare with the value entered by the user in the input control being validated. The default value is String.Empty.

Use the ValueToCompare property to specify a constant value to compare with the value entered by the user in the input control being validated. If the constant value specified by this property fails to convert to the data type specified by the BaseCompareValidator.Type property, an exception is thrown.


Do not set both the ControlToCompare and the ValueToCompare property at the same time. You can either compare the value of an input control to another input control, or to a constant value. If both properties are set, the ControlToCompare property takes precedence.

This property cannot be set by themes or style sheet themes. For more information, see ThemeableAttribute and Introduction to ASP.NET Themes.

The following code example demonstrates how to use the ValueToCompare property to compare the value entered by the user in a TextBox control with a constant value.

Security noteSecurity Note:

This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview (Visual Studio).

<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html xmlns="" >
    <title>CompareValidator ValueToCompare Example</title>
<script runat="server">
      void Button_Click(Object sender, EventArgs e) 

         Random rand_number = new Random();

         Compare1.ValueToCompare = rand_number.Next(1, 10).ToString();
         if (Page.IsValid) 
            lblOutput.Text = "You guessed correctly!!";
            lblOutput.Text = "You guessed poorly";

         lblOutput.Text += "<br /><br />" + "The number is: " + Compare1.ValueToCompare;

   <form id="form1" runat="server">

      <h3>CompareValidator ValueToCompare Example</h3>

      <h5>Pick a number between 1 and 10:</h5>
      <asp:TextBox id="TextBox1" 

      <br /><br />

      <asp:Button id="Button1"

      <br /><br />
      <asp:CompareValidator id="Compare1" 
      <br />
      <asp:Label id="lblOutput" 

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0