title: Why do I get "Cannot redirect after HTTP headers have been sent" when I call Response.Redirect()?
body: <p>When I call <code>Response.Redirect(someUrl)</code> I get the following HttpException:</p>
  
  <blockquote>
    <p>Cannot redirect after HTTP headers have been sent.</p>
  </blockquote>
  
  <p>Why do I get this? And how can I fix this issue?</p>