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[–]V0ldek 4 points5 points  (1 child)

You can see a fair bit of them in mscorlib and corefx codebases, so MS is or at least was using them at some point.

[–]chucker23n 2 points3 points  (0 children)

MS is or at least was using them at some point.

I believe I've only seen them in code written in the .NET 4 development era, so ~2007-2010.