Validation Summary duplicates messages, Validation display multiple time.

- Address should not blank - State should not blank - City should not blank - Zip Code should not blank - User Mobile Number should not blank - Email Address should not blank - Password should not blank - Confirm password should not blank - Name should not blank - Security code should not blank - Address should not blank - State should not blank - City should not blank - Zip Code should not blank - User Mobile Number should not blank - Email Address should not blank - Password should not blank - Confirm password should not blank - Name should not blank - Security code should not blank

My code is :-

<asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:ValidationSummary ID="ValidationSummary1" run ...