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The latest version of the CSharp2 and CSharp3 target documentation is located at the following link:
Visual Studio and the ANTLR C# Target
While the document focuses on Visual Studio 2010, everything except section 1.1 can be applied to Visual Studio 2008. Also, this document is currently limited to instructions for setting up a Visual Studio project to work with the CSharp2 or CSharp3 target, along with descriptions of a few substantial features unique to the C# targets.
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