New features in C# 4.5 and C# 5.0 http://www.b-virtual.com/new-features-in-c-4-5-and-c-5-0/
C# 5.0: More Than Just Async http://visualstudiomagazine.com/articles/2012/11/01/more-than-just-async.aspx
An Introduction to New Features in C# 5.0 http://blogs.msdn.com/b/mvpawardprogram/archive/2012/03/26/introduction-of-new-features-in-c-5-0.aspx
What Happens in an Async Method http://msdn.microsoft.com/en-us/library/hh191443.aspx
Asynchronous Programming in C# 5.0 using async and await http://www.codeproject.com/Tips/591586/Asynchronous-Programming-in-Csharp-5-0-using-async
closure in c#
C# Closures Explained http://www.codethinked.com/c-closures-explained
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