title: Update command not working in Dynamic Data Details view
body: <p>I have just create a very basic Dynamic Data web application using Entity Framework, and when I click the edit command from the GridView, to open a Details view, edit some fields, and click the <code>Update</code> link, nothing happens.  </p>
  
  <p>My question is what could cause this update to do nothing and are there any tips for diagnosing it?</p>
  
  <p><strong>MORE INFO</strong>  It seems the EntityDataSource 'hides' exceptions.  I have found more than one reason for the update or insert operation not completing, but I had to use a SQL trace and trap the command being sent.  Running that command manually gives a quick and visible SQL error.  Why this doesn't find its way to my UI is a mystery.</p>