Possible Duplicates:
.NET HashTable Vs Dictionary - Can the Dictionary be as fast?
Which Collection Class to use: Hashtable or Dictionary?
What are the benefits of using Hastable over Dictionary?
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Exact Duplicate: http://stackoverflow.com/questions/1089132/net-hashtable-vs-dictionary-can-the-dictionary-be-as-fast – rkg Mar 04 '11 at 06:47
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Performance characteristics. API's the same, implementation is different, so different operations are faster with one or the other. – Rafe Kettler Mar 04 '11 at 06:52
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@Rafe: In what way are the APIs the same? Hashtable is non-generic, Dictionary is generic. I'd say that's a pretty important difference between the two. (There are other differences too - where's TryGetValue on Hashtable? How do each of them behave when fetching a key which doesn't exist?) – Jon Skeet Mar 04 '11 at 07:04
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@Jon ah, I see this is a C# question. I had assumed it was a general question, and in most cases (there are always exceptions) mappings have similar APIs (there's usually a protocol or an interface defining what a map should look like) but different performance characteristics. – Rafe Kettler Mar 04 '11 at 07:06