using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;



namespace Dispose销毁目标

{

    public partial class Form1 : Form

    {

        

        Point start, end;

        bool mousedown = false;

        public Form1()

        {

            InitializeComponent();

        }



        private void Form1_Load(object sender, EventArgs e)

        {

            

        }



        private void Form1_MouseMove(object sender, MouseEventArgs e)

        {

            if (mousedown)

            {

                Bitmap bmp = new Bitmap(this.Width, this.Height);

                Graphics gr = Graphics.FromImage(bmp);

                //Graphics gr = this.CreateGraphics();

                gr.DrawRectangle(new Pen(Color.Red),start.X,start.Y,e.X-start.X,e.Y-start.Y);

                

                Graphics tg = this.CreateGraphics();

                tg.DrawImage(bmp, 0, 0);

                gr.Dispose();

                

            }