real world use of dynamic in c#

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Model;

using Moq;

namespace DynamicKeyword

{

    public class Base

    {

        public void foo(int x) { Console.WriteLine(x); }

    }

    public class Derived : Base

    {

        public void foo(string x) { Console.WriteLine(x); }

    }

    class Program

    {

        static void Main(string[] args)

        {

            dynamic baseclass = new Derived();

            dynamic d = "4";

            dynamic c=1;

            baseclass.foo(d);

            baseclass.foo(c);

            //new StaticTester().Call();

            //new ReflectiveTester().Call();

            //new DynamicTester().Call();

            Console.ReadKey(false);

        }

    }

}