[manigandham]

Runtimes are different from languages. The C# language has never been rebooted and is fully backwards compatible, and there's no better example of long-term support than Microsoft. You can still run apps from the MSDOS era, and even upgrade MSDOS through to Windows 10 if you have all the CDs today.

[pjmlp]

Runtimes and languages go hand-in-hand, a runtime that doesn't support everything that one expects from the standard library breaks compatibility.

Code starts getting full of #ifdefs

Siverlight, .NET Core, WinRT, UWP just to give three reboots.

No support for dynamic APIs, appdomains, IL generation on the fly, reflection APIs done in a different way, ...

Actually C# is not fully backwards compatible, variables declared on foreach statements changed their semantics in C# 5.

https://blogs.msdn.microsoft.com/ericlippert/2009/11/12/clos...

MS-DOS is only supported in 32 bit variants, a species in extinsion.

[int_19h]

> The C# language has never been rebooted and is fully backwards compatible

This is not true - there have been several breaking changes in C#-the-language since 1.0. For example:

https://davefancher.com/2012/11/03/c-5-0-breaking-changes/

[general8bitso]

So, like DOS 3.3 to 5 to 6.2, and Windows 3 to 3.1, to 95 to 98 to 98SE, to ME, to XP, to 7, to 8 to 8.1, to 10?

I think I was using floppies until Win 98?

[manigandham]

Here's a 10 hour video from DOS to Win10: https://www.youtube.com/watch?v=l60HHWWo9z4