using System;

using System.Drawing;

using System.Windows.Forms;

namespace Test

{

    public partial class Form1 : Form

    {

        private Point startPoint;

        private Point endPoint;

        private bool isDrawing = false;

        private Bitmap memoryBuffer;

        public Form1()

        {

            InitializeComponent();

            memoryBuffer = new Bitmap(pictureBox1.Width, pictureBox1.Height);

            pictureBox1.MouseUp += new MouseEventHandler(pictureBox1_MouseUp);

            pictureBox1.MouseDown += new MouseEventHandler(pictureBox1_MouseDown);

            pictureBox1.MouseMove += new MouseEventHandler(pictureBox1_MouseMove);

        }



        void pictureBox1_MouseUp(object sender, MouseEventArgs e)

        {

            isDrawing = false;

        }

        void pictureBox1_MouseDown(object sender, MouseEventArgs e)

        {

            startPoint = new Point(e.X, e.Y);

            isDrawing = true;

        }

        void pictureBox1_MouseMove(object sender, MouseEventArgs e)

        {

            endPoint = new Point(e.X, e.Y);

            drawSelectedRect();

   &nb