title: Does ASP.NET Web Forms prevent a double click submission?
body: <p>I'm working on an ASP.NET 4.0 Web Forms project, after a break of about 5 years, and I'm confused about the submit behaviour.</p>
  
  <p>In the click event of a button, I sleep the thread so that I can click the submit button multiple times.</p>
  
  <p>From what I can tell, ASP.NET is preventing the click event being called more than once. Is this true?</p>
  
  <p>BTW: I've turned off javascript for this test.</p>