How validationgroup works in button click

ASP.NET FAQS	Validation Controls FAQS >>
13. How validationgroup works in button click?
During postback, the Page class's IsValid property is set based only on the validation controls in the current validation group. The current validation group is determined by the control that caused validation to occur. For example, if a button control with a validation group of LoginGroup is clicked, then the IsValid property will return true if all validation controls whose ValidationGroup property is set to LoginGroup are valid.
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