title: How do I get my solution in Visual Studio back online in TFS?
body: <p>I had my solution in Visual Studio 2012 (which is under TFS source control) open and the TFS server (2010) was down. When I then made a change to one of the files and attempted to save it I got a prompt to ask whether I wanted to Overwrite the file saying the TFS server was down (can't remember the exact words) and the following message appeared in the Output window:</p>
  
  <pre><code>This solution is offline.  [Team Foundation Server: http://tfs1:8080/tfs/server]
  The solution was offline during its previous session and will remain offline.
  </code></pre>
  
  <p>How do I get the file change to be recognised as being among Pending Changes and the whole solution back online?</p>