What are the correct version numbers for C#?



Answers

The biggest problem when dealing with C#'s version numbers is the fact that it is not tied to a version of the .NET Framework, which it appears to be due to the synchronized releases between Visual Studio and the .NET Framework.

The version of C# is actually bound to the compiler, not the framework. For instance, in Visual Studio 2008 you can write C# 3.0 and target .NET Framework 2.0, 3.0 and 3.5. The C# 3.0 nomenclature describes the version of the code syntax and supported features in the same way that ANSI C89, C90, C99 describe the code syntax/features for C.

Take a look at Mono, and you will see that Mono 2.0 (mostly implemented version 2.0 of the .NET Framework from the ECMA specifications) supports the C# 3.0 syntax and features.

Question

What are the correct version numbers for C#? What came out when? Why can't I find any answers about C# 3.5?

This question is primarily to aid those who are searching for an answer using an incorrect version number, e.g. C# 3.5. The hope is that anyone failing to find an answer with the wrong version number will find this question and then search again with the right version number.




You can check the latest C# versions here




This is the same as most answers here, but tabularized for ease, and it has Visual Studio and .NET versions for completeness.

╔════════════╦════════════╦══════════════╦═════════════╦══════════════╗
║ C# version ║ VS version ║ .NET version ║ CLR version ║ Release date ║
╠════════════╬════════════╬══════════════╬═════════════╬══════════════╣
║    1.0     ║    2002    ║    1.0       ║     1.0     ║   Feb 2002   ║
║    1.2     ║    2003    ║    1.1       ║     1.1     ║   Apr 2003   ║
║    2.0     ║    2005    ║    2.0       ║     2.0     ║   Nov 2005   ║
║            ║            ║    3.0       ║     2.0     ║   Nov 2006   ║
║    3.0     ║    2008    ║    3.5       ║     2.0     ║   Nov 2007   ║
║    4.0     ║    2010    ║    4.0       ║     4       ║   Apr 2010   ║
║    5.0     ║    2012    ║    4.5       ║     4       ║   Aug 2012   ║
║    5.0     ║    2013    ║    4.5.1     ║     4       ║   Oct 2013   ║
║            ║            ║    4.5.2     ║     4       ║   May 2014   ║
║    6.0     ║    2015    ║    4.6       ║     4       ║   Jul 2015   ║
║            ║            ║    4.6.1     ║     4       ║   Nov 2015   ║
║            ║            ║    4.6.2     ║     4       ║   Aug 2016   ║
║    7.0     ║    2017    ║              ║             ║   Mar 2017   ║
║            ║            ║    4.7       ║     4       ║   May 2017   ║
║    7.1     ║ 2017(v15.3)║              ║             ║   Aug 2017   ║
║            ║            ║    4.7.1     ║     4       ║   Oct 2017   ║
║    7.2     ║ 2017(v15.5)║              ║             ║   Dec 2017   ║
╚════════════╩════════════╩══════════════╩═════════════╩══════════════╝



I've summarised most of the versions in this table. The only ones missing should be ASP.NET Core versions. I've also added different versions of ASP.NET MVC.

Note that ASP.NET 5 has been rebranded as ASP.NET Core 1.0 and ASP.NET MVC 6 has been rebranded as ASP.NET Core MVC 1.0.0. I believe this change occurred sometime around Jan 2016.

I have included the release date of ASP.NET 5 RC1 in the table, but I've yet to include ASP.NET core 1.0 and other core versions, because I couldn't find the exact release dates. You can read more about the release dates regarding ASP.NET Core here: When is ASP.NET Core 1.0 (ASP.NET 5 / vNext) scheduled for release?




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