Out of curiosity after reading some articles on how the HashSet<T> (introduced in .Net 3.5) class is more performant than the List<T> class for set operations, I set about doing some experiments of my own to get a feel of just how much faster a HashSet is, and under what…

I wrote previously about how you can set up multiple observable sequences and subscribe to them with multiple observers and create a many-to-many relationship between them.