C# is a [Microsoft] language standard.  Microsoft provides its own
"Introduction and Overview" here 
[http://msdn.microsoft.com/vstudio/techinfo/articles/upgrade/Csharpintro.asp]
(but note that MS moves its Web pages around quite capriciously;
this page is likely to expire at any time). 

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++]
 [who was the main designer of C#?]
 [what is it used for?]
 [can it be used with Tcl or Tk?]

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2003/01/06 JJM - Yes, it can be used with Tcl/Tk via [TCLBridge].





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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:
   * http://www.csharptoday.com , sponsored by Wrox
   * http://www.c-sharpcorner.com
   * http://www.csharphelp.com
   * Microsoft's own "Visual C# .NET Home Page" [http://msdn.microsoft.com/vcsharp/]
   * http://www.csharp-station.com
   * http://www.MasterCSharp.com