title: ModelState.AddModelError not showing any message
body: <p>I am using telerik mvc grid. In my table I have unique key defined for a field. And in controller I am catching the error using try ... catch inside DbUpdateException.</p>
  
  <p>in catch block I want to handle the error and show error messsage in view. So using following line,</p>
  
  <pre><code>ModelState.AddModelError("PROGRAM_ID", "Access for this program already exists.");
  return View();
  </code></pre>
  
  <p>But this is not showing error message. Any idea why?</p>