HashSet and its method with Example Using C#

HashSet is collection which stored unique element in unordered manner.In HashSet perform below operation like-
1) Add
2) Remove
3) Contains
4) Clear 
5) CopyTo etc.

Syntax-
HashSet<int> hashset=new HashSet<int>();

1) Add Element in Hashset-
hashset.Add(1);
hashset.Add(2);

hashset.Add(3);

hashset.Add(4);

2) Remove Element from HashSet-
hashset.remove("Element name");
hashset.RemoveWhere(s=>s=="Elementname");

3)Clear  HashSet
hashset.clear();

Example-

using System;

using System.Collections;

namespace TestApp

{  

  class Program

    {

        static void Main(string[] args)

        {

           HashSet<string> name = new HashSet<string> ();

  //Adding Element

  name.Add("Pankaj");

  name.Add("Ravi");

  name.Add("Kushal");

  name.Add("Amar");

          //Remove Element

            name.RemoveWhere(s=>s.Contains("Ravi"));

foreach (string npa in name)

{

Console.WriteLine(npa);

}

        }

    }

}