Stack and C# examples

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main() {
      Stack stack = new Stack();
      stack.Push("A");
      stack.Push("B");
      stack.Push("C");
      stack.Push("D");
      stack.Push("E");
      stack.Push("F");
      stack.Push("G");
      stack.Push("H");
      stack.Push("I");
      stack.Push("J");
      Console.WriteLine("Count of elements = "+stack.Count);
      Console.WriteLine("Element at the top of stack = " + stack.Peek());
   }
}

Count of elements = 10
Element at the top of stack = J
Count of elements = 10

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main() {
      Stack stack = new Stack();
      stack.Push(100);
      stack.Push(150);
      stack.Push(175);
      stack.Push(200);
      stack.Push(225);
      stack.Push(250);
      stack.Push(300);
      stack.Push(400);
      stack.Push(450);
      stack.Push(500);
      Console.WriteLine("Elements in the Stack:");      
      foreach(var val in stack) {
         Console.WriteLine(val);
      }
      Console.WriteLine("Count of elements in the Stack = "+stack.Count);
      Console.WriteLine("Does Stack has the element 400?= "+stack.Contains(400));
   }
}

Elements in the Stack:
500
450
400
300
250
225
200
175
150
100
Count of elements in the Stack = 10
Does Stack has the element40400?= False