private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            Font f=new System.Drawing.Font("宋体",13);
            Brush b=new SolidBrush(Color.Black);

            e.Graphics.DrawString(richTextBox1.Text, f, b, 10, 10);
        }

private void 打印设置ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            pageSetupDialog1.Document = printDocument1;
            pageSetupDialog1.ShowDialog();
        }

private void 打印预览VToolStripMenuItem_Click(object sender, EventArgs e)
        {
            printPreviewDialog1.Document = printDocument1;
            printPreviewDialog1.ShowDialog();
        }

private void button1_Click(object sender, EventArgs e)
        {
            printPreviewControl1.Document = printDocument1;

        }

 private void 打印PToolStripMenuItem_Click(object sender, EventArgs e)
        {
            printDialog1.Document = printDocument1;
            DialogResult dr = printDialog1.ShowDialog();
            if (dr == DialogResult.OK)
            {
                printDocument1.Print();
            }
        }