1) Introduction of C sharp Language,

                                       C#(Sharp) introduction

C# is the most popular language in world. C# was developed by Microsoft within its .NET framework initiative and later approved as a standard by ECMA (ECMA-334) C# programming language is a general-purpose, OOPS based programming language. C# development team was lead by "Anders Hejlsberg" in 2002.

C# programming language is one of the languages designed for the (CLI) Common Language Infrastructure.

First version of C# is 1.0 with .NET framework 1.0 and Visual Studio is 2002.

Version	.NET Framework	Visual Studio	Important Features
C# 1.0	.NET Framework 1.0/1.1	Visual Studio .NET 2002	Basic features
C# 2.0	.NET Framework 2.0	Visual Studio 2005	Generics Partial types Anonymous methods Iterators Nullable types Private setters (properties) Method group conversions (delegates) Covariance and Contra-variance Static classes
C# 3.0	.NET Framework 3.0\3.5	Visual Studio 2008	Implicitly typed local variables Object and collection initializers Auto-Implemented properties Anonymous types Extension methods Query expressions Lambda expressions Expression trees Partial Methods
C# 4.0	.NET Framework 4.0	Visual Studio 2010	Dynamic binding (late binding) Named and optional arguments Generic co- and contravariance Embedded interop types
C# 5.0	.NET Framework 4.5	Visual Studio 2012/2013	Async features Caller information
C# 6.0	.NET Framework 4.6	Visual Studio 2013/2015	Expression Bodied Methods Auto-property initializer nameof Expression Primary constructor Await in catch block Exception Filter String Interpolation
C# 7.0	.NET Core	Visual Studio 2017	out variables Tuples Discards Pattern Matching Local functions Generalized async return types throw Expressions