using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        ConcreteComponent component = new ConcreteComponent();

        component.DoSomething();

        ConcreteDecorator decorator = new ConcreteDecorator(new ConcreteComponent());

        decorator.DoSomethingElse();

    }

    class ConcreteComponent : IComponent

    {

        public void DoSomething()

        {

            Console.WriteLine("Doing something!");

        }

    }

    interface IComponent

    {

        void DoSomething();

    }

    abstract class Decorator : IComponent

    {

        protected IComponent Component  { get; set; }

        public Decorator(IComponent component)

        {

            this.Component = component;

        }

        public void DoSomething()

        {

            this.Component.DoSomething();

        }

    }

    class ConcreteDecorator : Decorator

    {

        public ConcreteDecorator(IComponent component) : base(component) {}

        public void DoSomethingElse()

        {

            Console.WriteLine("Doing something else!");

        }

    }

}