C# is a Microsoft language standard. Microsoft provides its own "Introduction and Overview" here [L1 ] (but note that MS moves its Web pages around quite capriciously; this page is likely to expire at any time). Widely-respected Chief C# Architect Anders Hejlsberg emphasizes that though ideas from Java, Smalltalk, and Modula influenced C#, his focus was to make it close to C++.
It was introduced with the .NET Framework.
Visual Studio .NET ships with a C# compiler.
Mono is an Open Source version of C# and its related libraries.
[explain how it's like Java and C++] [what is it used for?]
Can C# be used with Tcl or Tk?
2003/01/06 JJM - Yes, it can be used with Tcl/Tk via TCLBridge. CL hopes to return at some point to argue that there are other potential links between C# and Tcl/Tk--though TCLBridge is certainly a fine one on its own.
There's a great deal of competition for mindshare among those who think they want to program with C#. Among the leading online resources are: