How to make a simple yes/no popup in ASP.NET that return the result back to my c#?

Question

With ASP.NET, how do I prompt the user for a yes/no question and getting the result back to my .ascx?

So far I can open a confirmation dialog with use of Javascript,

Answer 1

Another option is to show yes/no:

<script>     
        function AlertFunction() {
            if (confirm('Are you sure you want to save this thing into the database?')) {
               $('#ConfirmMessageResponse').val('Yes');
            } else {
                $('#ConfirmMessageResponse').val('No');
            }
        }
    </script>

to handle it from .net side:

string confirmValue = ConfirmMessageResponse.Value;
                if (confirmValue == "Yes")
                {...}