title: TFS 2013 building .NET 4.6 / C# 6.0
body: <p>We use TFS 2013 to as our build server.  I've started a C# 6.0 project and I am trying to get it to build.  I am using the new null-conditional operators, and my build chokes.  I've tried installing several things on the TFS server, including the targeting pack and VS 2015.  I've tried providing /tv:14.0 to the MSBuild arguments.</p>
  
  <blockquote>
    <p>Configuration\EntityEntityConfig.cs (270): Invalid expression term '.'<br>
    Configuration\EntityEntityConfig.cs (283): Invalid expression term '.'<br>
    Configuration\EntityEntityConfig.cs (283): Syntax error, ':' expected<br>
    ... etc.</p>
  </blockquote>
  
  <p>At this point, I have no idea what else to try.  Any suggestions would be greatly appreciated.</p>