Dictionary vs Hashtable in c#

• Dictionary

o    It returns error if we try to find a key which does not exist.

o    It is faster than a Hashtable because there is no boxing and unboxing.

o    Only public static members are thread safe.

o    Dictionary is a generic type which means we can use it with any data type.

• Hashtable

o    It returns null if we try to find a key which does not exist.

o    It is slower than dictionary because it requires boxing and unboxing.

o    All the members in a Hashtable are thread safe,

o    Hashtable is not a generic type.