title: Validate Request in .net 4.0 returning 500 error
body: <p>I have an application in .net 4.0 that I need to turn Validate Request off for. 
  I have put <em>ValidateRequest = false</em> in the .aspx page but that does nothing. I then added  </p>
  
  <pre><code>&lt;httpRuntime requestValidationMode = "2.0"/&gt; 
  </code></pre>
  
  <p>in the web.config file inside <em>system.web</em> section but the application now returns <em>500 - Internal server error</em>.</p>
  
  <p>Any idea what I'm doing wrong?</p>
  
  <p>Thank you!</p>