<A target="_blank" href="http://post.oreilly.com/rd/9z1z1g3kamhtd6ev4uo84481er7vtcqd1phv5t09g18">In this book Joseph Albahari and Ben Albahari answer questions</A> about how to use C# 4.0 or the .NET CLR. Organized around concepts and use cases, this fourth edition includes coverage of new C# topics such as parallel programming, code contracts, dynamic programming, security, and COM interoperability.