private void btnStart_Click(object sender, EventArgs e)
        {
            int num = 0;
            string path = "";

            int width = pictureBox1.Size.Width;
            int height = pictureBox1.Size.Height;

            Image image = Image.FromFile(listBox1.SelectedItems[0].ToString());
            Bitmap bmp = new Bitmap(200, 85, PixelFormat.Format24bppRgb);
            bmp.SetResolution(80, 100);

            Graphics gfx = Graphics.FromImage(bmp);
            gfx.SmoothingMode = SmoothingMode.HighQuality;
            gfx.CompositingQuality = CompositingQuality.HighQuality;
            gfx.InterpolationMode = InterpolationMode.HighQualityBicubic;
            gfx.PixelOffsetMode = PixelOffsetMode.HighQuality;

            //Rectangle crop = new Rectangle();
            string[] lines = File.ReadAllLines(@"F:\DATA\Draw_Multiple_IMG\DXApplication1\coordinatesA.txt");
            foreach (string line in lines)
            {
                RectangleConverter r = new RectangleConverter();
                var rectangle = (Rectangle)r.ConvertFromString(line);
                using (var gr = Graphics.FromImage(bmp))
                {
                    gfx.DrawImage(image, new Rectangle(0, 0, 200, 200), rectangle, GraphicsUnit.Pixel);
                    if (!File.Exists(path))
                    {
                        do
                        {
                            path = @"F:\DATA\Draw_Multiple_IMG\DXApplication1\Image\File xuất\" +
                                Path.GetFileNameWithoutExtension(listBox1.SelectedItems[0].ToString()) + "_A" + ++num + ".tif";
                        } while (File.Exists(path));
                        using (MemoryStream ms = new MemoryStream())
                        {
                            using (FileStream fs = new FileStream(path, FileMode.Create, FileAccess.ReadWrite))
                            {
                                bmp.Save(ms, ImageFormat.Tiff);
                                byte[] bytes = ms.ToArray();
                                fs.Write(bytes, 0, bytes.Length);
                            }
                        }
                    }
                }
            }
            // Dispose to free up resources
            image.Dispose();
            bmp.Dispose();
            gfx.Dispose();
        }