title: How do I disable C# 6 Support in Visual Studio 2015?
body: <h2>Background</h2>
  
  <p>We have a project that we're developing in VS 2015 with C#6 enabled that occasionally needs to be opened by developers using VS 2013 without C#6. </p>
  
  <p>We have no intention to use C# 6 within this particular solution (as much as I'd like to).</p>
  
  <h2>Problem</h2>
  
  <p>Visual Studio and ReSharper suggest helpful C# 6 language constructs that render the solution inoperable in earlier versions of Visual Studio without C#6 support.</p>
  
  <p>I've <a href="https://stackoverflow.com/questions/27621458/resharper-disable-c-sharp-6-0-support">disabled the ReSharper C#6 support</a> but I can't seem to disable / limit C# features across the whole solution.</p>
  
  <h2>Question</h2>
  
  <p>How do I limit C# to C#5 capabilities within a solution or within Visual Studio 2015?</p>