title: How do I enable C# 6 for my existing project?
body: <p>I have an existing project that I'd like to convert to use the new C# 6 features.</p>
  
  <p>I've put this code into my application</p>
  
  <pre><code>public class Pairing(string left, string right)
  {
  
  }
  </code></pre>
  
  <p>But I get a CS1514 at the begin paren.</p>
  
  <p>I'm running Visual Studio 2015</p>
  
  <p>I've tried changing my language for the project (project properties -> build -> advanced -> language version -> C# 6.0), but that hasn't solved the problem.</p>
  
  <p>I feel like I'm missing something obvious. Any ideas?</p>