สอบถามเรื่องการ Print บางส่วน ของ Form จากโค๊ดนี้ครับ c#

 public frmrecipe1x()
        {
            InitializeComponent();

            printPanel.Size = this.ClientSize;
        }

 private void CaptureScreen()
        {
            Graphics myGraphics = printPanel.CreateGraphics();
            Size s = printPanel.Size;
            memoryImage = new Bitmap(320, s.Height, myGraphics);
            Graphics memoryGraphics = Graphics.FromImage(memoryImage);

            //memoryGraphics.CopyFromScreen(this.Location.X, this.Location.Y, 0, 0, s);

            Point screenLoc = PointToScreen(printPanel.Location); // Get the location of the Panel in Screen Coordinates
            memoryGraphics.CopyFromScreen(screenLoc.X, screenLoc.Y, 0, 0, s);
        }

private void button1_Click(object sender, EventArgs e)
        {
              CaptureScreen();
              printPreviewDialog1.ShowDialog();
        }

  private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            e.Graphics.DrawImage(memoryImage, 0, 0);
        }