C# program to check whether element exists in stack or not

In this C# program, we will learn how to check element exist in stack or not? Here we use Contains method of Stack class.
Submitted by IncludeHelp, on November 23, 2017

Stack.Contains() method

This is a method of 'Stack' class, its returns ‘true’ if stack contains given element else it returns ‘false’.


bool Contains(object item);


item : given item that is exist in stack or not.

Program to check given element exists in stack or not in C#

using System;
using System.Collections;

namespace ConsoleApplication1
    class Program
        static void Main()
            Stack S = new Stack(5);


            if (S.Contains(30))
                Console.WriteLine("Item found in stack");
                Console.WriteLine("Item did not find in stack");


Item found in stack

In this program, we are pushing 4 elements (10,20,30,40) in stack, and then we are checking item 30 is exist in stack or not using Contains method of Stack class?

Note: In above program, to use 'Stack' class, we need to include System.Collection namespace.

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