using System;

using System.Collections;

public class Program

{

    public static void Main()

    {

        Stack MyStack = new Stack(); 

        MyStack.Push(5);

        MyStack.Push(1);

        MyStack.Push(2); //last item to be pushed on stack ( means at top)

        //print stack using foreach loop

        Console.WriteLine("Stack After Pushing items:");

        PrintStack(MyStack);

        Console.WriteLine();

        //remove item from stack

        MyStack.Pop();

        //now check stack again

        Console.WriteLine("Stack After pop: ");

        PrintStack(MyStack);

        Console.WriteLine();

        //check if element exists using .Contains

        Console.WriteLine("5 Exists in Stack? : "+MyStack.Contains(5));     

        Console.WriteLine();

        //check top item using Peek method

        Console.WriteLine("Top Item of stack is : "+MyStack.Peek());    

    }

    //print stack method

    public static void PrintStack(Stack MyStack)

    {

        foreach(var item in MyStack)

        {

            Console.WriteLine(item);

        }

    }

​

}