title: How to make a simple yes/no popup in ASP.NET that return the result back to my c#?
body: <p>With ASP.NET, how do I prompt the user for a yes/no question and getting the result back to my .ascx?</p>
  
  <p>So far I can open a confirmation dialog with use of Javascript, but I can't return the value. But I don't know if this is the right approach. </p>