problem regarding modal popup could you pls help me

Hi,

Thank you for your post!

Based on my understanding, you just need toKeeping Modal Popups open after the postback is returned.

Some code like this:

Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);

function EndRequestHandler(sender, args) {
document.getElementById('Button2').click();
}

If you have further questions,let me know.

Best Regards,