Validator controls automatically trigger validation checks for every postback?irrespective of whether you need validation or not. To prevent this, set CausesValidation=”False” for the control for which you do not need validation. The code below will help illustrate:
If you simply drop two buttons on the form, clicking either button triggers validation by default. But because you don’t need a validation check when you hit Button2, setting CausesValidation=”False” in the Button2 control will do the trick.