C# .NET 3.0/3.5 features in 2.0 using Visual Studio 2008

Question

What are some of the new features that can be used in .NET 2.0 that are specific to C# 3.0/3.5 after upgrading to Visual Studio 2008? Also, what are some of the features tha

Answer 1

To define extension methods, you'll need to supply the following class if you're targeting .NET 2.0:

namespace System.Runtime.CompilerServices {
  [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class | AttributeTargets.Assembly)]
    sealed class ExtensionAttribute : Attribute { }
}