If you want to be absolutely sure that you didn’t miss a new type, property or method inside the .NET 4.0 framework, have a look at the following links. They provide a comprehensive list of the new namespaces, types, and members in the .NET Framework version 4 and provide links to the corresponding reference topics.
I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.