The . . . . . . . . validator is used to compare an entry with a constant value or the property stored in a control.

Here is an example of how to use a CompareValidator:

<asp:CompareValidator ID="CompareValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="The value in TextBox1 must be greater than 10." Operator="GreaterThan" Value="10" />

In this example, the CompareValidator will validate that the value entered in TextBox1 is greater than 10. If the value is not greater than 10, an error message will be displayed.