stack with stack Data type, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Create stack with stack Data type
           Stack st = new Stack();
           st.Push(2);
           st.Push(4);
           st.Push(6);
           st.Push(8);
           printStack(st);
           st.Pop();
           st.Pop();
           printStack(st);
       }
       public static void printStack(Stack st){
          Console.WriteLine("\n Stack elements");
           foreach (int i in st) {
            Console.WriteLine(i);
           }
           Console.WriteLine("Number of elements in the stack " +st.Count);
           Console.WriteLine("Does stack contain the number 3 "+st.Contains(6));
        }
   }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 0,08 sec, cpu time: 0,08 sec, average memory usage: 13 Mb, average nr of threads: 3, absolute service time: 0,26 sec