Comparing two null objects

Maybe it is my experience with databases but I have always thought that whenever you compare something with null it is always false. Obviously there are some exceptions.

Hashtable vs ConcurrentDictionary

Historically I've seen the Hashtable be favored over ConcurrentDictionary with the assumption that is was more efficient allowing for lock free reads. Well they both allow lock free reads so which one is really the better option?

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