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  private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            SolidBrush pinsel =new SolidBrush(richTextBox1.SelectionColor);
            Font schrift = new Font(richTextBox1.SelectionFont,richTextBox1.SelectionFont.Style);
            e.Graphics.DrawString(richTextBox1.Text , schrift, pinsel, 20,e.MarginBounds.Right,e.MarginBounds.Top);
        }

        private void toolStripButton3_Click(object sender, EventArgs e)
        {
            if (printDialog1.ShowDialog()==DialogResult.OK)

            printDocument1.Print();
        }