About C#

C# language is intended to be a simple, modern, general-purpose, object-oriented programming language designed by Microsoft. Currently C# 4.0 is available which is released with .net framwork 4.0

C# is the programming language that most directly reflects the underlying Common Language Infrastructure (CLI). Most of its intrinsic types correspond to value-types implemented by the CLI framework. However, the language specification does not state the code generation requirements of the compiler: that is, it does not state that a C# compiler must target a Common Language Runtime, or generate Common Intermediate Language (CIL), or generate any other specific format. 

C# provides a large set of operators, which are symbols that specify which operations to perform in an expression. C# predefines the usual arithmetic and logical operators, as well as a variety of others. In addition, many operators can be overloaded by the user, thus changing their meaning when applied to a user-defined type.

For more information, you can refer C# Wiki or C# MSDN.