Check if a HashSet is a subset of the specified collection in C#

To check if a HashSet is a subset of the specified collection, 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("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("KL");
      set2.Add("MN");
      set2.Add("OP");
      set2.Add("QR");
      Console.WriteLine("Elements in HashSet2");
      foreach(string val in set2){
         Console.WriteLine(val);
      }
      Console.WriteLine("Is set1 a subset of set2? "+set1.IsSubsetOf(set2));
   }
}

Output

This will produce the following output −

Elements in HashSet1
EF
OP
Elements in HashSet2
KL
MN
OP
QR
Is set1 a subset of set2? False

Example

Let us see another example −

 Live Demo

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main(){
      HashSet<string> set1 = new HashSet<string>();
      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("OP");
      set2.Add("QR");
      Console.WriteLine("Elements in HashSet2");
      foreach(string val in set2){
         Console.WriteLine(val);
      }
      Console.WriteLine("Is set1 a subset of set2? "+set1.IsSubsetOf(set2));
   }
}

Output

This will produce the following output −

Elements in HashSet1
EF
OP
Elements in HashSet2
EF
OP
QR
Is set1 a subset of set2? True