title: Is it possible to use the C# 4 compiler in an ASP.NET 3.5 Web Site?
body: <p>I am working with an ASP.NET Web Site project targeting .NET framework version 3.5 and I am wondering if it is possible to use the C# compiler for C#4. At the moment I don't have the time to upgrade the whole site to .NET framework 4 but I want to be able to use for instance optional parameters. As far as I know, optional parameters is not a framework 4 feature.</p>
  
  <p>It this is possible, what changes to web.config must be done? (I guess it is a configuration issue.)</p>