title: How to upgrade to C# 5?
body: <p>This seems like it should be easy, but searching on the web has not turned up anything. I want to take advantage of C#'s async and await, but I have C# version 4.0.30319 (which I got from <code>Console.Write(typeof(string).Assembly.ImageRuntimeVersion);</code>).</p>
  
  <p>I just upgraded from VS12 to VS13, and I am using .NET 4.5. I thought my C# version would upgrade as well, but it hasn't (async and await still give errors).</p>
  
  <p>Any ideas?</p>