title: Response.Redirect in .NET 4.0
body: <p><code>Response.Redirect()</code> no longer working when upgrade the application to ASP.NET 4.0 </p>
  
  <ul>
  <li><code>Response.Redirect()</code> is used inside Update panel</li>
  <li>and we using the <code>AjaxToolKit 4.0</code> </li>
  </ul>
  
  <p>it gives me the error:</p>
  
  <blockquote>
    <p>Error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the
        server could not be parsed. Common causes for this error are when the response is 
        modified by calls to Response.Write(), response filters, HttpModules, or server trace is 
        enabled.
        Details: Error parsing near</p>
  </blockquote>