Decorator

using System;

namespace Decorator
{
    abstract class Burger
    {
        public string Name { get; protected set;}

        public Burger(string n)
        {
            this.Name = n;
        }

        public abstract int GetCost();
    }

    abstract class BurgerDecorator: Burger
    {
        protected Burger burger;
        public BurgerDecorator(string n, Burger burger) : base(n)
        {
            this.burger = burger;
        }
    }

    class CheeseBurger : Burger
    {
        public CheeseBurger() : base("CheeseBurger")
        {}

        public override int GetCost()
        {
            return 50;
        }
    }

    class CheekenBurger : Burger
    {
        public CheekenBurger() : base("Cheeken burger")
        {}

        public override int GetCost()
        {
            return 49;
        }
    }

    class Vegetables : BurgerDecorator
    {
        public Vegetables(Burger b) : base (b.Name + " + vegetables", b)
        {}

        public override int GetCost()
        {
            return burger.GetCost () + 20;
        }
    }

    class DoubleCheese : BurgerDecorator
    {
        public DoubleCheese(Burger b) : base (b.Name + " + double cheese", b)
        {}

        public override int GetCost()
        {
            return burger.GetCost () + 30;
        }
    }

    class DoubleCutlet : BurgerDecorator
    {
        public DoubleCutlet(Burger b) : base (b.Name + " + double cutlet", b)
        {}

        public override int GetCost()
        {
            return burger.GetCost () + 50;
        }
    }

    class MainClass
    {
        public static void Main (string[] args)
        {
            Burger myBurger = new CheekenBurger ();
            myBurger = new DoubleCutlet (myBurger);
            myBurger = new DoubleCheese (myBurger);
            Burger myBurger2 = new CheeseBurger ();
            myBurger2 = new Vegetables (myBurger2);
            Console.WriteLine ("Your order:");
            Console.WriteLine ("1) {0} = {1}", myBurger.Name, myBurger.GetCost());
            Console.WriteLine ("2) {0} = {1}", myBurger2.Name, myBurger2.GetCost());
            Console.WriteLine ("Order price = {0}", myBurger.GetCost() + myBurger2.GetCost());
        }
    }
}