Difference between Dictionary and Hashtable in C#?

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Ravi Vishwakarma · Accepted Answer

Difference between Hashtable and Dictionary
Hashtableand 
Dictionary
Hashtable is present in System.Collections namespace.
Dictionary is present in System.Collections.Generic namespace
Hashtable is the non-generic collection, it can store data in key, the value of any type of data
Dictionary is the generic collection, it can store data in key, value pair of a specific datatype
Hashtable is thread-safe
The only member is thread-safe
return null if the key is not present in hashtable
throw an exception if the key is not present
slower than Dictionaryand 
faster than Hashtableand

Difference between Dictionary and Hashtable in C#?

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Hashtable	Dictionary
Hashtable is present in System.Collections namespace.	Dictionary is present in System.Collections.Generic namespace
Hashtable is the non-generic collection, it can store data in key, the value of any type of data	Dictionary is the generic collection, it can store data in key, value pair of a specific datatype
Hashtable is thread-safe	The only member is thread-safe
return null if the key is not present in hashtable	throw an exception if the key is not present
slower than Dictionary	faster than Hashtable