title: ASP.NET Invalid value for key 'attachdbfilename'
body: <p>The next error pops when I initialize the <code>SqlConnection</code> object:</p>
  
  <p><code>Invalid value for key 'attachdbfilename'.</code></p>
  
  <p>I have tried to solve this issue for hours (Also tried any of the advices I could find on SO), but with no success.</p>
  
  <p>This is my connection string:</p>
  
  <pre><code>Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|Users.mdf;Integrated Security=True
  </code></pre>
  
  <p><code>Users.mdf</code> is located in the <code>App_Data</code> folder.</p>
  
  <p>I am using Visual Studio 2012 Ultimate, .NET is Ver 4.5, with SQL Server 2012.
  This issue started after I formatted my main driver, and installed the software I mentioned above.</p>
  
  <p>Thanks, Guy</p>