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Hidden features? Really? yield, ?? operator, @ "operator" for raw strings, nullable types, etc, are considered as "hidden" / advanced features?

I don't want to sound snobbish, but at least 90% of that list I consider as a basic C# knowledge. If you don't know how to make an enumerable with yield, or insert some debug code with DEBUG or guard resource with using(), what exactly you know?

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I didn't knew how to make an enumerable with an yield.

http://csharpindepth.com/Articles/Chapter11/StreamingAndIter...

I had used it to make a state machine but didn't know its relation to IEnumerable. The article was enlightening to a C# latecomer like me.

I agree that 'hidden' isn't exactly an accurate description, but that is a pretty good list of keywords that commonly get reinvented by less experienced C#-ers. It would be more accurately described as a list of underused idioms, but the title doesn't really detract from its value.

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