很简单的委托与事件解决方案

using System;
using System.Drawing;
using System.Windows.Forms;

class Test
{
    public delegate void PaintEventHandler(object objSend, PaintEventArgs pea);
    public static void Main()
    {
        Form form=new Form();
        form.Text="PaintEvent";
        form.Paint += new PaintEventHandler(MyPaintEvent);
        Application.Run(form);
        MessageBox.Show("Application is return ","PaintEvent");
    }

    static void MyPaintEvent(object objSend, PaintEventArgs pea)
    {
         Graphics graphics=pea.Graphics;
         graphics.Clear(Color.Chocolate);
    }
}

form.Paint += new PaintEventHandler(MyPaintEvent);