winform打印

private void printForm()
{
            img = new Bitmap(panel1.Width, panel1.Height);
            Size s = new Size();
            s.Width = panel1.Width;
            s.Height = panel1.Height;
            Graphics g = Graphics.FromImage(img);
            g.CopyFromScreen(this.Location.X + 6, this.Location.Y +133, 0, 0, s);
        }
        private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            e.Graphics.DrawImage(this.img, new Rectangle(80, 50, panel1.Width,panel1.Height));
        }

        private void btnPrint_Click(object sender, EventArgs e)
        {
            try
            {
                printForm();
                this.printPreviewDialog1.Document = this.printDocument1;
                this.printPreviewDialog1.ShowDialog(this);
                printDocument1.Print();
            }
            catch
            {
                MessageBox.Show("请检查您的打印机是否连接正常!");
                return;
            }
        }