I have a submit button and when a user click the button, it will check on the database to see if the user has been registered to the system. If they do, it will pop up a confirmation window. If they click ok, then we will re-register, otherwise it will stop there.
How to call a javascript pop up within the submit button? I don't want to declare the btnSubmit.AddAttribute during page load, because if there is such user in the database, we don't want to show a pop-up.
Thanks.
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