title: Instance Failure Exception
body: <p>It was working still yesterday but now it is not working because sqlexpress service is stopped and it is not starting. I have connection string:</p>
  
  <pre><code>Data Source=.\SQLEXPRESS;
  AttachDbFilename=C:\Program Files\Setup1\DB.mdf;
  Integrated Security=True;
  Connect Timeout=30;
  User Instance=True
  </code></pre>
  
  <p>When I open this connection it throws exception <code>Instance Failure</code>. This is my WPF application and I am using .NET Framework 4.0.</p>