A coworker (Hey, Evgeny!) came to me with a puzzler today. He has an object that exposes an event, and he wants to know whether he's already subscribed to that event. Two things immediately came to mind - the first was that he really shouldn't be doing that, and the second was to suggest that...

A relatively obscure new keyword in C# 2.0 is the default(T) keyword. It's shorthand for checking if the given generic parameter T is a value type or reference type. If it's a reference type, it returns null. Otherwise it returns 0/false/0.0 or whatever the default value for the type is. For some reason...