Remove the specified element from a HashSet in C#

To remove the specified element from a HashSet, the code is as follows −

Example

 Live Demo

using System; using System.Collections.Generic; public class Demo {    public static void Main(){       HashSet<string> set1 = new HashSet<string>();       set1.Add("AB");       set1.Add("CD");       set1.Add("EF");       set1.Add("AB");       set1.Add("IJ");       set1.Add("KL");       set1.Add("EF");       set1.Add("OP");       Console.WriteLine("Elements in HashSet1");       foreach(string val in set1){          Console.WriteLine(val);       }       HashSet<string> set2 = new HashSet<string>();       set2.Add("EF");       set2.Add("KL");       Console.WriteLine("Elements in HashSet2");       foreach(string val in set2){          Console.WriteLine(val);       }       Console.WriteLine("Count of elements in HashSet2 = " + set2.Count);       set2.Remove("KL");       Console.WriteLine("
Elements in HashSet2... (UPDATED)");       foreach (string res in set2){          Console.WriteLine(res);       }       Console.WriteLine("Count of elements in HashSet2 (Updated) = " + set2.Count);       Console.WriteLine("
Is set1 a superset of set2? "+set1.IsSupersetOf(set2));    } }

Output

This will produce the following output −

Elements in HashSet1 AB CD EF IJ KL OP Elements in HashSet2 EF KL Count of elements in HashSet2 = 2 Elements in HashSet2... (UPDATED) EF Count of elements in HashSet2 (Updated) = 1 Is set1 a superset of set2? True

Example

Let us see another example −

 Live Demo

using System; using System.Collections.Generic; public class Demo {    public static void Main(){       HashSet<int> set1 = new HashSet<int>();       set1.Add(100);       set1.Add(200);       set1.Add(300);       set1.Add(400);       set1.Add(500);       set1.Add(600);       Console.WriteLine("Elements in HashSet");       foreach(int val in set1){          Console.WriteLine(val);       }       Console.WriteLine("Count of elements in HashSet = " + set1.Count);       set1.Remove(300);       Console.WriteLine("
Elements in HashSet... (UPDATED)");       foreach (int res in set1){          Console.WriteLine(res);       }       Console.WriteLine("Count of elements in HashSet (Updated) = " + set1.Count);    } }

Output

This will produce the following output −

Elements in HashSet 100 200 300 400 500 600 Count of elements in HashSet = 6 Elements in HashSet... (UPDATED) 100 200 400 500 600 Count of elements in HashSet (Updated) = 5