title: visual studio 2010 asp.net gridview is not a known element
body: <p>I am using VS2010 Pro with SP1.  For some reason its complaining about all my Gridview controls and nothing else.  I do not see any errors in the markup.</p>
  
  <p>So far I have tried 2 things</p>
  
  <ol>
  <li><p>Following the instructions here <a href="http://www.gotknowhow.com/articles/fix-validation-element-not-supported-visual-studio-2010" rel="nofollow">http://www.gotknowhow.com/articles/fix-validation-element-not-supported-visual-studio-2010</a></p></li>
  <li><p>Deleting my solutions .suo file</p></li>
  </ol>
  
  <p>Neither of these are working.  I still keep getting the same problem.  All I find via google are hundreds of people having the same problem with all sorts of different controls.</p>
  
  <p>Are there any more things I can try ?</p>
  
  <p>Thanks,</p>
  
  <p>Steed.</p>