Yes since you cannot be certain that client-side validation will be
executed. Some examples of when this might happen:
1. Client browser does not support the validation code.
2. Client browser has javascript disabled.
3. Post to the form comes from outside your application.
Any of these might be due to either "innocent" and valid client behaviour.
However, you should also be protecting yourself against malicious attempts
to hack your application, which can use any of the above mechanisms as well
in order to deliberately bypass client-side validation.
HTH,
Nicole
"R.A." <te**@hotmail.com> wrote in message
news:ek**************@TK2MSFTNGP09.phx.gbl...
Hi
If I use the client side validation control, do I need to check for
IsValid
on the server side? if yes then why?
Thanks