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C#(C sharp) An object-oriented programming language that is based on C++ with elements from Visual Basic and Java. Like Java, C# provides automatic garbage collection, whereas traditional C and C++ do not. C# was created by Microsoft and also standardized by the European Computer Manufacturers Association (ECMA). Microsoft designed C# as its flagship programming language for the .NET environment.
Why the Number Sign?
Because it is similar to the sharp music notation symbol, the number sign (#) is used. See .NET Framework, J#, F# and C.