Remove all elements from a HashSet in C#

To remove all elements from a HashSet, the code is as follows −

Example

 Live Demo

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main(String[] args){
      HashSet<string> set1 = new HashSet<string>();
      set1.Add("A");
      set1.Add("B");
      set1.Add("C");
      set1.Add("D");
      set1.Add("E");
      set1.Add("F");
      set1.Add("G");
      set1.Add("H");
      Console.WriteLine("Elements in HashSet1...");
      foreach (string res in set1){
         Console.WriteLine(res);
      }
      HashSet<string> set2 = new HashSet<string>();
      set2.Add("John");
      set2.Add("Jacob");
      set2.Add("Ryan");
      set2.Add("Tom");
      set2.Add("Andy");
      set2.Add("Tim");
      set2.Add("Steve");
      set2.Add("Mark");
      Console.WriteLine("Elements in HashSet2...");
      foreach (string res in set2){
         Console.WriteLine(res);
      }
      Console.WriteLine("Is HashSet1 equal to HashSet2? = "+set1.Equals(set2));
      Console.WriteLine("Count of HashSet2 = "+set2.Count);
      set2.Clear();
      Console.WriteLine("Count of HashSet2 (updated) = "+set2.Count);
   }
}

Output

This will produce the following output −

Elements in HashSet1...
A
B
C
D
E
F
G
H
Elements in HashSet2...
John
Jacob
Ryan
Tom
Andy
Tim
Steve
Mark
Is HashSet1 equal to HashSet2? = False Count of HashSet2 = 8
Count of HashSet2 (updated) = 0

Example

Let us see another example −

 Live Demo

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main(String[] args){
      HashSet<string> set1 = new HashSet<string>();
      set1.Add("A");
      set1.Add("B");
      set1.Add("C");
      set1.Add("D");
      set1.Add("E");
      set1.Add("F");
      set1.Add("G");
      set1.Add("H");
      Console.WriteLine("Elements in HashSet...");
      foreach (string res in set1){
         Console.WriteLine(res);
      }
      Console.WriteLine("Count of HashSet1 = "+set1.Count);
      set1.Clear();
      Console.WriteLine("Count of HashSet1 (updated) = "+set1.Count);
   }
}

Output

This will produce the following output −

Elements in HashSet...
A
B
C
D
E
F
G
H
Count of HashSet1 = 8
Count of HashSet1 (updated) = 0