class MainClass
    {
        public static void Main ()
        {
            Action<dynamic[]> act = FirstMethod;
            dynamic[] args = { 1, 2 };
            act (args);

            act = SecondMethod;
            act (args);
        }

        private static void FirstMethod(params dynamic[] args)
        {
            foreach (var arg in args) {
            }
            Console.WriteLine (args[0]);
        }

        private static void SecondMethod(params dynamic[] args)
        {
            foreach (var arg in args) {
            }
            Console.WriteLine (args[1]);
        }
    }