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.

Developer.com
Contains resources, tools, articles, discussion areas, and events of interest to Internet/intranet developers. Directories include: ActiveX, Java, JavaBeans, JavaScript, Microsoft and .NET, open source and VRML.

Exploring Lambda Expression Trees
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.