C# | Check if a SortedSet object is a proper subset of the specified collection Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report SortedSet class represents the collection of objects in sorted order. This class comes under the System.Collections.Generic namespace. SortedSet<T>.IsProperSubsetOf(IEnumerable<T>) method is used to check if a SortedSet<T> object is a proper subset of the specified collection or not. Properties: In C#, SortedSet class can be used to store, remove or view elements. It maintains ascending order and does not store duplicate elements. It is suggested to use SortedSet class if you have to store unique elements and maintain ascending order. Syntax: mySet1.IsProperSubsetOf(mySet2); Here, mySet1 and mySet2 are the objects of two SortedSets. Return Value: This method return True if the SortedSet<T> object is a proper subset of other, otherwise False. Below programs illustrate the use of SortedSet<T>.IsProperSubsetOf(IEnumerable<T>) method: Example 1: CSHARP // C# code to Check if a SortedSet is a // proper subset of the specified collection using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Creating a SortedSet of integers SortedSet<int> mySet1 = new SortedSet<int>(); // Inserting elements in SortedSet for (int i = 0; i < 10; i++) { mySet1.Add(i); } // Creating a SortedSet of integers SortedSet<int> mySet2 = new SortedSet<int>(); // Inserting elements in SortedSet mySet2.Add(3); mySet2.Add(4); mySet2.Add(5); mySet2.Add(6); // Check if a SortedSet is a proper subset // of the specified collection // It should return true as SortedSet mySet2 // is a proper subset of SortedSet mySet1 Console.WriteLine(mySet2.IsProperSubsetOf(mySet1)); } } Output: True Example 2: CSHARP // C# code to Check if a SortedSet is a // proper subset of the specified collection using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Creating a SortedSet of strings SortedSet<string> mySet1 = new SortedSet<string>(); // Inserting elements in SortedSet mySet1.Add("A"); mySet1.Add("B"); mySet1.Add("C"); mySet1.Add("D"); mySet1.Add("E"); // Creating a SortedSet of strings SortedSet<string> mySet2 = new SortedSet<string>(); // Inserting elements in SortedSet mySet2.Add("B"); mySet2.Add("C"); mySet2.Add("D"); mySet2.Add("E"); // Check if a SortedSet is a proper subset // of the specified collection // It should return true as SortedSet mySet1 // is proper subset of SortedSet mySet2 Console.WriteLine(mySet2.IsProperSubsetOf(mySet1)); } } Output: True Reference: https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.sortedset-1.ispropersubsetof?view=netcore-2.1 Comment More info S Sahil_Bansall Follow Improve Article Tags : Misc C# CSharp-method CSharp-Generic-SortedSet CSharp-Generic-Namespace +1 More Explore IntroductionC# Tutorial 4 min read Introduction to .NET Framework 6 min read C# .NET Framework (Basic Architecture and Component Stack) 6 min read C# Hello World 2 min read Common Language Runtime (CLR) in C# 4 min read FundamentalsC# Identifiers 2 min read Data Types in C# 6 min read C# Variables 4 min read C# Literals 5 min read Operators in C# 7 min read C# Keywords 5 min read Control StatementsC# Decision Making (if, if-else, if-else-if ladder, nested if, switch, nested switch) 5 min read C# Switch Statement 4 min read Loops in C# 4 min read C# Jump Statements (Break, Continue, Goto, Return and Throw) 4 min read OOP ConceptsClass and Objects in C# 4 min read Constructors in C# 5 min read C# Inheritance 3 min read Encapsulation in C# 2 min read C# Abstraction 4 min read MethodsMethods in C# 4 min read Method Overloading in C# 4 min read C# | Method Parameters 7 min read Method Overriding in C# 7 min read Anonymous Method in C# 3 min read ArraysArrays in C# 6 min read Jagged Arrays in C# 4 min read Array Class in C# 5 min read How to Sort an Array in C# | Array.Sort() Method Set - 1 8 min read How to find the rank of an array in C# 2 min read ArrayListArrayList in C# 6 min read C# ArrayList Class 7 min read C# | Array vs ArrayList 2 min read StringStrings in C# 6 min read C# Verbatim String Literal - @ 5 min read C# String Class 9 min read C# StringBuilder 4 min read C# String vs StringBuilder 3 min read TupleC# Tuple 7 min read C# Tuple Class 3 min read C# ValueTuple 7 min read C# ValueTuple Struct 4 min read IndexersC# Indexers 4 min read C# Multidimensional Indexers 5 min read C# - Overloading of Indexers 3 min read Like