title: How to show a message box in an ASP.NET page?
body: <p>As I was a Windows programmer it was so easy to show a message box on a form.</p>
  
  <p>But on an <a href="http://en.wikipedia.org/wiki/ASP.NET" rel="nofollow noreferrer">ASP.NET</a> page I don't know how can I show it?</p>
  
  <p>Actually I have some condition and based on that I want to show a message box to the user to get his/her response and based on that response I want to continue.
  For example I want to ask the user "Do you want to continue?" with two buttons "Yes" &amp; "No".</p>