//第一步 设置打印属性
        private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            //设置字体样式
            Font f = new System.Drawing.Font("微软雅黑", 16);
            f = richTextBox1.Font;
            //设置字体颜色
            Brush b = new SolidBrush(richTextBox1.ForeColor);

            //e.绘制.画字符串（要打印的文本，文本格式，画刷-颜色和纹理，位置坐标）
            e.Graphics.DrawString(richTextBox1.Text, f, b, 20, 10);
        }
        //字体样式设置
        private void button4_Click(object sender, EventArgs e)
        {
            DialogResult dr = fontDialog1.ShowDialog();
            if (dr == DialogResult.OK)
            {
                richTextBox1.Font = fontDialog1.Font;
                richTextBox1.ForeColor = fontDialog1.Color;
            }
        }

 //第二步 设置打印页面设置
        private void button1_Click(object sender, EventArgs e)
        {
            pageSetupDialog1.Document = printDocument1;
            pageSetupDialog1.ShowDialog();
        }

//第三步 打印预览一
        private void button2_Click(object sender, EventArgs e)
        {
            printPreviewControl1.Document = printDocument1;
        }

//第三步 打印预览二
        private void button2_Click(object sender, EventArgs e)
        {
            printPreviewDialog1.Document = printDocument1;
            printPreviewDialog1.ShowDialog();
        }

 //第四步 开始打印
        private void button3_Click(object sender, EventArgs e)
        {
            printDialog1.Document = printDocument1;
            DialogResult dr = printDialog1.ShowDialog();
            if (dr == DialogResult.OK)
            {
                printDocument1.Print();
            }
        }