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When to use a Dictionary (Hashtable)?

Here's a pretty good tutorial on hashtable / dictionaries. Found it while studying some performance issues between the use of try/catch vs contains key for a dictionary with about 200,000 key/value associations.

A Dictionary is closely related to a HashTable. There are many subtle differences between them, but one important difference is that a Dictionary is generally faster than a Hashtable for storing data.

The reason is that a Dictionary takes strongly-typed values as its input, so you do not suffer the performance impact of storing generic Objects and boxing/unboxing them into the proper types during use.

http://www.kirupa.com/net/dictionary_hashtable.htm