First Clicking a button results in page refreshing,on second click showing the results.

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C#

VB

I have a Search button ,for seaching the meetings based on id's writeen on textboxes,but if any wrong entries in textboxes we will get validations.if a valid meeting id or valid date will shows the datagrid .but this happening on every second click of a button.for first click the page getting refreshed.please tell me the solution ...i need the results in first click itself.

Thanks in advance