A HashSet is an unordered collection of the unique elements. It comes under the System.Collections.Generic namespace. It is used in a situation where we want to prevent duplicates from being inserted in the collection. As far as performance is concerned, it is better in comparison to the list.
Here, mySet1 and mySet2 are 2 HashSets.
Return Value: The function returns true if mySet1 is Proper Superset of mySet2, else returns false.
Exception: This method will give ArgumentNullException if the HashSet is empty.
Below given are some examples to understand the implementation in a better way: