How often has the C# language standard been updated and what is the current version?
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There are no ECMA/ISO standards for C# 3 or 4. Yet. But I somehow doubt there ever will be, considering all the nasty politics.
As for the de facto standard compiler by Microsoft, C# 1 was in January 2002, C# 2 in November 2005, C# 3 in November 2006 and C# 4 just this April.
Mono, which is the runtime for Linux and OS X, has had C# 3 support since 2008, but C# 4 isn't out yet.
There's a C# version history on Wikipedia.

Rei Miyasaka
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