title: C# 4.0 and .Net 3.5
body: <p>So we've finally got VS2010 on some developer stations at work and can use the C# 4.0 features.  Although most of what we develop will still have to target .Net 3.5 for the time being.</p>
  
  <p>When I start a new project and set the target to .Net 3.5, it still allows me to use C# 4.0 such as dynamic.  Can you therefore use C#4.0 features whilst targetting .net 3.5 and will these features work in environments where .Net 4.0 is not available?</p>
  
  <p>Thanks.</p>