Boxing and Unboxing in C#

using System;
using System.Collections;

namespace Boxing
{
    class Program
    {
        static void Main(string[] args)
        {
            // Pretend this is .Net 1.0
            string chiken = "chicken";
            int fish = 1;
            ArrayList Truck = new ArrayList();
            Truck.Add(chiken);
            Truck.Add(fish); // boxing: value type into object type
            int secondFish = 2;

            Truck[1] = (int) Truck[1] + secondFish; // unboxing: object type into value type
        }
    }
}