The CompareValidator control compares a value in one control with a fixed value, or, a value in another control.
Example:-
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
First number:<br />
<asp:TextBox runat="server" id="n1" /><br /><br />
Last number:<br />
<asp:TextBox runat="server" id="n2" />
<br />
<br />
<asp:CompareValidator
runat="server" id="cmpNumbers" controltovalidate="n1"
controltocompare="n2" operator="Equal" type="Integer"
errormessage="Both numbers are not equal!" BorderColor="#FF0066"
BorderStyle="Solid" /><br />
</div>
</form>
</body>
</html>
Example:-
Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
First number:<br />
<asp:TextBox runat="server" id="n1" /><br /><br />
Last number:<br />
<asp:TextBox runat="server" id="n2" />
<br />
<br />
<asp:CompareValidator
runat="server" id="cmpNumbers" controltovalidate="n1"
controltocompare="n2" operator="Equal" type="Integer"
errormessage="Both numbers are not equal!" BorderColor="#FF0066"
BorderStyle="Solid" /><br />
</div>
</form>
</body>
</html>
Output:
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