Customer Validator


<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="CustomField must be an even number!"

ControlToValidate="CustomField" ClientValidationFunction="ValidateEvent"

OnServerValidate="ValidateEvent">

  </asp:CustomValidator>



  <script type="text/javascript">



   function ValidateEvent(oSrc, args)

     {



args.IsValid = ((args.Value % 2) == 0);

      }



  </script>





   protected void ValidateEvent(object source, ServerValidateEventArgs args)

  {



    if ((Convert.ToInt32(args.Value) % 2) == 0)

            args.IsValid = true;

    else

            args.IsValid = false;



  }