Web Reference: Jul 11, 2025 · Understanding the difference between Hashtable and Dictionary plays a very important role in choosing the right data structure for our C# applications. The main difference between Hashtable and Dictionary is: Hashtable: This is an older, non-generic collection that treats everything as objects. The Hashtable class is a specific type of dictionary class that uses an integer value (called a hash) to aid in the storage of its keys. The Hashtable class uses the hash to speed up the searching for a specific key in the collection. The System.Collections.Hashtable class, and the System.Collections.Generic.Dictionary and System.Collections.Concurrent.ConcurrentDictionary generic classes, implement the System.Collections.IDictionary interface. The Dictionary generic class also implements the IDictionary generic interface. Therefore, each element in these collections is a key-and-value pair.
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