You can group these controls for validation purposes by setting the ValidationGroup
property. If you set button1's ValidationGroup
property to "group1"...
<asp:Button ValidationGroup="group1" ...></asp:Button>
Then, all validation controls that belong to the same group will perform user input validation when this button is clicked. Here's an example of how set the validation group for validation controls...
<asp:ValidationSummary ValidationGroup="group1" ...></asp:ValidationGroup>
<asp:RequiredFieldValidator ValidationGroup="group1" ...></asp:RequiredFieldValidator>