c#实现打印预览和打印【打印的位置不准确】

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        //http://dotnet.chinaitlab.com/List_233.html
        private void button4_Click(object sender, EventArgs e)
        {

            //预览功能,需要增加一个控件:ThePrintDocument
            string strText = richTextBox1.Text;
            StringReader myReader = new StringReader(strText);
            PrintPreviewDialog printPreviewDialog1 = new PrintPreviewDialog();
            printPreviewDialog1.Document = ThePrintDocument;
            printPreviewDialog1.FormBorderStyle = FormBorderStyle.Fixed3D;
            printPreviewDialog1.ShowDialog();
        }

        private void button5_Click(object sender, EventArgs e)
        {
            //打印功能,需要增加一个控件:printDialog
            printDialog1.Document = ThePrintDocument;
            string strText = richTextBox1.Text;
            StringReader myReader = new StringReader(strText);
            if (printDialog1.ShowDialog() == DialogResult.OK)
            {
                //这个方法将调用ThePrintDocument_PrintPage事件完成打印任务
                ThePrintDocument.Print();
            }
        }

        private void ThePrintDocument_PrintPage(object sender, PrintPageEventArgs ev)
        {
            //真正打印功能的实现
            string strText = richTextBox1.Text;
            StringReader myReader = new StringReader(strText);

            float linesPerPage = 0;
            float yPosition = 0;
            int count = 0;

            float leftMargin = ev.MarginBounds.Left;
            float topMargin = ev.MarginBounds.Top;

            string line = null;
            Font printFont = richTextBox1.Font;
            SolidBrush myBrush = new SolidBrush(Color.Black);

            //计算每一页打印多少行
            linesPerPage = ev.MarginBounds.Height / printFont.GetHeight(ev.Graphics);

            //重复使用StringReader对象　,打印出richTextBox1中的所有内容
            while (count < linesPerPage && ((line = myReader.ReadLine()) != null))
            {
                //　计算出要打印的下一行所基于页面的位置
                yPosition = topMargin + (count * printFont.GetHeight(ev.Graphics));
                //　打印出richTextBox1中的下一行内容
                ev.Graphics.DrawString(line, printFont, myBrush, leftMargin, yPosition, new StringFormat());
                count++;
            }
            //　判断如果还要下一页，则继续打印
            if (line != null)
                ev.HasMorePages = true;
            else
                ev.HasMorePages = false;
            myBrush.Dispose();
        }