Difference between Hashtable and Dictionary

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The following table lists the differences between Hashtable and Dictionary in C#.

Hashtable	Dictionary
Hashtable is included in the System.Collections namespace.	Dictionary is included in the System.Collections.Generic namespace.
Hashtable is a loosely typed (non-generic) collection, this means it stores key-value pairs of any data types.	Dictionary is a generic collection. So it can store key-value pairs of specific data types.
Hashtable is thread safe.	Only public static members are thread safe in Dictionary.
Hashtable returns null if we try to find a key which does not exist.	Dictionary throws an exception if we try to find a key which does not exist.
Data retrieval is slower than dictionary because of boxing-unboxing.	Data retrieval is faster than Hashtable.