static void Main(string[] args)
        {
            Console.WriteLine("***Strategy Pattern Demo***");
            IChoice ic  = null;
            Context cxt = new Context();

            //For simplicity,we are considering 2 user inputs only.
            for (int i = 1; i <= 2; i++)
            {
                Console.WriteLine("\nEnter ur choice(1 or 2)");
                string c = Console.ReadLine();
                if (c.Equals("1"))
                {
                    ic = new FirstChoice();
                }
                else
                {
                    ic = new SecondChoice();
                }
                cxt.SetChoice(ic);
                cxt.ShowChoice();
            }
            Console.ReadKey();
        }