<!DOCTYPE html>
<html>
<body>
<form runat="server">
<table border="0" bgcolor="#b0c4de">
<tr style="vertical-align:top">
<td colspan="4"><h4>Compare two values</h4></td>
</tr>
<tr style="vertical-align:top">
<td><asp:TextBox id="txt1" runat="server" /></td>
<td> = </td>
<td><asp:TextBox id="txt2" runat="server" /></td>
<td><asp:Button Text="Validate" runat="server" /></td>
</tr>
</table>
<br>
<asp:CompareValidator
id="compval"
Display="dynamic"
ControlToValidate="txt1"
ControlToCompare="txt2"
ForeColor="red"
BackColor="yellow"
Type="String"
EnableClientScript="false"
Text="Validation Failed!"
runat="server" />
</form>
</body>
</html>