public class Stack< itemtype >
    {
         // Declare storage space for the stack. 
        private itemtype[] items = new itemtype[100];

         // Define a generic Push method. 
        public void Push(itemtype data)
        {
             // To do: check for stackcount out of range. 
            items[stackcounter++] = data;
        }

         // Define a generic Pop method. 
        public itemtype Pop()
        {
             // To do: check for stackcount out of range. 
            return items[--stackcounter];
        }

         // This variable stores the location of the current object in the stack. 
        private int stackcounter = 0;
    }
    class Program
    {
        static void Main(string[] args)
    {
            // Create an instance of the stack, this one for integers. 
            Stack<int> myintstack = new Stack<int>();
             // Store some values. 
            for (int i = 1; i < 10; i++)
                myintstack.Push(i*10);
             // Retreive the values. 
            for (int i = 1; i< 10; i++)
                Console.WriteLine(myintstack.Pop());
            // Create an instance of the stack, this one for strings. 
            Stack<string> mystringstack = new Stack<string>();
             // Store some values. 
            mystringstack.Push("World");
            mystringstack.Push("Hello");
             // Retreive the values. 
            Console.WriteLine(mystringstack.Pop());
            Console.WriteLine(mystringstack.Pop());
            Console.ReadLine();
        }
    }