hash table

Question

what is hash table & Dictionery??

Hemant Kumar · Answer

Dictionary provides generic types  which allows to create dictionary of any type. Where as HashTable will store values in the form of object. So while using a collection of primitive types such as integer hashtable will have additional cost of boxing and unboxing where as dictionary is generic it will not have additional cost of boxing and unboxing. If the collection if of type intdatetimefloat etc Dictionary provides better performance than hashtable. If the collection is of type custom object Both will provide same performance.

Atul Kumar · Answer

Dictionary is a collection key value pair where each collection member is bounded with a unique key in the collection. There could not be duplicate key in collection. There is generic version available for Dictionary in .net. Hashtable is a collection of key/value pairs that are organized based on the hash code of the key.