title: Cannot Attach Databases or Create new one - SQL Server 2008
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/1424811/sql-server-2008-express-failed-to-attach-mdf-file">SQL Server 2008 Express failed to attach mdf file</a>  </p>
  </blockquote>
  
  
  
  <p>I use SQL Server 2008 r2,
  I am new at SQL Server , so I have some example files I want to attach it.</p>
  
  <p>for some reason it showing the following messegebox :</p>
  
  <blockquote>
    <p>Cannot show requested dialog.     Additional information : parameter name : nColIndex   Actual value was -1. (Microsoft.Sqlserver.GridControl)</p>
  </blockquote>
  
  <p>Thanks!</p>