How tragic it is that VB gets type cases, guard cases and exception filters well before C#.

I guess that's why F# is starting to hit the prime time.

Some of these seem undocumented anywhere that I could find.

I posted an SO question about some of them, if anyone has any input on the matter: http://stackoverflow.com/questions/22881465/what-do-these-ne...

I've written a little bit more about them using the examples from CodePlex on my blog ( http://blog.filipekberg.se/2014/04/04/microsoft-open-sources... ).

There were also some interesting discussions on the C# sub-reddit: http://www.reddit.com/r/csharp/comments/225g4b/microsoft_ope...

Hope that helps and answers some of the questions you have!

Lot of good stuff in there. I don't use C# day-to-day anymore, but I always wanted string interpolation.