Versions and Summary of C#

Vesion of C#

Version	CLR	Date	.NET Framework	Visual Studio
C# 1.0	1.0	January 2002	.NET Framework 1.0	Visual Studio .Net 2002
C# 1.2	1.1	April 2003	.NET Framework 1.1	Visual Studio .Net 2003
C# 2.0	2.0	November 2005	.NET Framework 2.0	Visual Studio 2005
C# 3.0	2.0/2.0 SP1	November 2007	.NET Framework 2.0/3.0/3.5	Visual Studio 2008
C# 4.0	4.0	April 2010	.NET Framework 4.0	Visual Studio 2010
C# 5.0	4.5	August 2012	.NET Framework 4.5	Visual Studio 2012

Features of C# according to Versions

Summary of versions
C# 2.0	C# 3.0	C# 4.0	C# 5.0	Future
Generics Partial types Anonymous methods Iterators Nullable types Private setters (properties) Method group conversions (delegates) Covariance and Contra-variance Static classes	Implicitly typed local variables Object and collection initializers Auto-Implemented properties Anonymous types Extension methods Query expressions Lambda expressions Expression trees Partial Methods	Dynamic binding Named and optional arguments Generic co- and contravariance Embedded interop types ("NoPIA")	Asynchronous methods Caller info attributes	C# 5.0 Compiler-as-a-service (Roslyn) C# 6.0 Import type members into namespace Succinct syntax for primary constructors Readonly properties Property expressions (property lambdas) Method expressions Parameter arrays for IEnumerable interfaces Succinct null checking Multiple return values Constructor type inference