What is used hashset in C#?

In C#, HashSet is an unordered collection of unique elements. This collection is introduced in .NET 3.5. It supports the implementation of sets and uses the hash table for storage.

 

https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.hashset-1?view=net-6.0 

https://www.c-sharpcorner.com/article/working-with-hashset-in-c-sharp/

https://www.geeksforgeeks.org/hashset-in-c-sharp-with-examples/#:~:text=In%20C%23%2C%20HashSet%20is%20an,the%20hash%20table%20for%20storage. 

HashSet is Unorder Collection which contains unique values to get High performance in C#.net.

 

for more details check the below links

https://www.c-sharpcorner.com/article/c-sharp-hashset-with-example/

https://www.geeksforgeeks.org/hashset-in-c-sharp-with-examples/