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Lambda Expression

Lambda Expressions are based on function programming; they have been added to .NET. A Lambda Expression is essentially a very compressed function often
 used where a delegate would be used, and they have a precise syntax, which is roughly: 

Function(arg1, arg2...argn) expression

You can explicitly type the parameters — that is, provide the argument types or leave them unspecified and the compiler will figure it out. The expression part is a statement such as a + b, or s.Length. The Return keyword is implicit.

See also "Exploring Lambda Expression Trees" on Developer.com.

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