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namespace MyDecorator {
    public partial class Photo : Form, IPhoto {
        public Photo() {
            Paint += new PaintEventHandler(Drawer);
        }

        public void Drawer(Object source, PaintEventArgs e) {
            Debug.WriteLine("Paint Form1.cs");
        }
    }
}

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namespace MyDecorator {
    class Decorator : Form, IPhoto  {
        IPhoto photo;
        string text;

        public Decorator(IPhoto photo, string text) : base() {
            this.photo = photo;
            this.text = text;
            Paint += new PaintEventHandler(Drawer);
        }

        public void Drawer(Object source, PaintEventArgs e) {
            photo.Drawer(source, e);
            Debug.WriteLine("Paint Decorator.cs");
        }
    }
}

---------------------------------------------------------------------

namespace MyDecorator {
    interface IPhoto {
        void Drawer(Object source, PaintEventArgs e);
    }
}

---------------------------------------------------------------------

namespace MyDecorator {
    static class Program {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Photo obj = new Photo();
            Decorator dec = new Decorator(obj, "test");
            Application.Run(dec);
        }
    }
}