Version of C# Programming Language

In the course of C# Programming Language development, the C# language has gone through several versions.

The course of its development is shown in the tabular format:

Version	Language specification			Date	.NET Framework	Visual Studio
	ECMA*	ISO/IEC**	Microsoft
C# 1.0	December 2002	April 2003	January 2002	January 2002	.NET Framework 1.0	Visual Studio .NET 2002
C# 1.2			October 2003	April 2003	.NET Framework 1.1	Visual Studio .NET 2003
C# 2.0	June 2006	September 2006	September 2005	November 2005	.NET Framework 2.0	Visual Studio 2005
C# 3.0	None		August 2007	November 2007	.NET Framework 2.0 (Except LINQ/Query Extensions) .NET Framework 3.0 (Except LINQ/Query Extensions) .NET Framework 3.5	Visual Studio 2008 Visual Studio 2010
C# 4.0			April 2010	April 2010	.NET Framework 4	Visual Studio 2010
C# 5.0			N/A	August 2012	.NET Framework 4.5	Visual Studio 2012

*ECMA International is an international, private (membership-based) non-profit standards organization for information and communication systems. It acquired its current name in 1994, when the European Computer Manufacturers Association (ECMA) changed its name to reflect the organization's global reach and activities. As a consequence, the name is no longer considered an acronym and no longer uses full capitalization.

**ISO/IEC JTC 1 is Joint Technical Committee 1 of the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). It deals with all matters of information technology. 

It was formed in 1987 as a merger between ISO/TC 97 (Information Technology) and IEC/TC 83, with IEC//SC 47B joining later. The intent was to bring together in a single Committee the Information Technology standardization activities of the two parent organizations.

The Microsoft C# 2.0 specification document only contains the new 2.0 features. For older features use the 1.2 specification above. No ECMA or ISO/IEC specifications exist for C# 3.0, 4.0 or 5.0.

Summary of Versions of C# Programming Language:

	C# 2.0	C# 3.0	C# 4.0	C# 5.0	Future
Features added	Generics Partial types Anonymous methods Iterators Nullable types Private setters (properties) Method group conversions (delegates)	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	Compiler-as-a-service("Roslyn")