title: Where to configure Razor page language version to C# 6?
body: <p>Recently I've tried to use some C# 6 new feature (interpolated strings) in my ASP.NET MVC (5) .cshtml view, but when running got an error message complaining about the <code>$</code>. It is clear the compiler in C# 5 compatibility mode, or worst it <em>is</em> a C# 5 compiler. </p>
  
  <p>When in editor a popup warning warns me (I do not know it is VS or ReSharper) <code>Feature 'Interpolated strings' is not available in C# 5. Please use language version 6 or greater.</code></p>
  
  <p>The project itself was set to C# 6, and I can use C# 6 features in my build time compiled code like controllers etc. </p>
  
  <p>Q: Where should I set page compiler version, <em>and will this C# 6 compiler available when I deploy my web app to Azure there?</em> </p>