What are new features in linq in c#4.0? [closed]

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I am C# developer , i like to use linq very much. i like to know new features of linq in c#4.0.i already know ZIP method there.Is there Any new methods like That?

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There is the new Zip() extension method http://msdn.microsoft.com/en-us/library/dd267698.aspx , the new EF 4.0 http://msdn.microsoft.com/en-us/data/aa937723 While it isn't directly LINQ, they created the Tuple class tree http://msdn.microsoft.com/en-us/library/system.tuple.aspx , and expanded Action<T1, T2...> and Func<T1, T2...> up to 10 parameters. I'm not sure if covariance and contravariance should be listed here (IEnumerable<T> is covariant, and "he" is one of the basic "objects" of LINQ)

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A number of these changes here are related to LINQ:

http://msdn.microsoft.com/en-us/library/ex6y04yf.aspx

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PLINQ (Parallel LINQ) is an interesting addition in 4.0: start reading at http://msdn.microsoft.com/en-us/library/dd460688.aspx