F# (pronounced F sharp) is a mixed functional and imperative programming language for the Microsoft .NET platform. F# was developed by Don Syme at Microsoft Research, and has a core language that is similar to that of the Ocaml language (itself a member of the ML programming language family). While F# doesn't do everything that OCaml does, it provides some features of its own, like making all strings Unicode. As of April 2005, F# is on version 1.0.
F# is a research project to demonstrate how .NET enables interoperability between different programming paradigms. F# showcases a set of extensions to .NET's intermediate language IL, called ILX, which demonstrate how a strict curried functional language may be compiled efficiently.
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Still it is in beta stage. There is no more examples for learning this language.