C# 热敏打印机小问题

这个问题出现的几率不大。出现的时候打印只能打印一行数据，下面的内容都不出现。有时候多打印几次就好了，不知道为什么，但是加上预览之后就不出现了。请各位大侠指教。下面是代码：

private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            MyPrint1(e.Graphics);
        }
private void MyPrint1(Graphics g)
        {
            try
            {

                Pen pen = new Pen(Brushes.Black);
                Font font = new Font("宋体", 10);
                Font titleFont = new Font("宋体", 16, FontStyle.Bold);
                //写字
                //// g.DrawImage(pictureBox2.Image, 40, 5,100, 40);
                string company = "";
                DataSet ds = departmentBll.GetList(" isdeleted ='root'");
                if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
                {
                    company = ds.Tables[0].Rows[0]["Sname"].ToString();
                }

                g.DrawString(company, font, Brushes.Black, new RectangleF(5, 5, 400, 20));
                g.DrawLine(pen, new Point(0, 25), new Point(400, 25));

                VisitorInfo VImodel = TempVI;

                if (TempVI.Picture != null && TempVI.Picture.Length != 0)
                {
                    g.DrawImage(GetImageByByteArray(VImodel.Picture), 40, 40, 100, 123);
                }
                else if (TempVI.VisitorPicture != null && TempVI.VisitorPicture.Length != 0)
                {
                    g.DrawImage(GetImageByByteArray(VImodel.VisitorPicture), 40, 40, 100, 123);
                }
                else
                {
                    g.DrawImage(GetImageByByteArray(Peric.ISMSIRA.Common.CommonCL.ImageUtil.BitmapToBytes

(Peric.ISMSIRA.VMSM.Properties.Resources.wu)), 40, 40, 100, 123);
                }

                g.DrawString("访客姓名：" + VImodel.Name, font, Brushes.Black, new RectangleF(5, 170, 400, 20));
                g.DrawString("访客性别：" + VImodel.Sex, font, Brushes.Black, new RectangleF(5, 190, 600, 50));
                g.DrawString("同行人数：" + VImodel.VisitorNum, font, Brushes.Black, new RectangleF(5, 210, 600,

50));
                g.DrawString("登记地点：" + VImodel.RegistAddress, font, Brushes.Black, new RectangleF(5, 230, 600,

50));
                g.DrawString("访客单位：" + VImodel.Company, font, Brushes.Black, new RectangleF(5, 250, 600, 50));

                string[] workerNames = VImodel.WorkerName.Split('、');//被访人姓名的名称数组；
                string[] workerDepartments = VImodel.WDepartName.Split('、');//被访人所属部门的数组；

                g.DrawString("被访人：" + workerNames[0], font, Brushes.Black, new RectangleF(5, 270, 600, 50));

                int y = 270;
                if (workerNames != null && workerNames.Length > 1)
                {
                    for (int i = 1; i < workerNames.Length; i++)
                    {
                        y += 30;
                        g.DrawString(workerNames[i], font, Brushes.Black, new RectangleF(74, y, 600, 50));
                    }

                }
                y += 30;
                g.DrawString("被访部门：" + workerDepartments[0], font, Brushes.Black, new RectangleF(5, y, 600,

50));

                if (workerDepartments != null && workerDepartments.Length > 1)
                {
                    for (int i = 1; i < workerDepartments.Length; i++)
                    {
                        y += 30;
                        g.DrawString(workerDepartments[i], font, Brushes.Black, new RectangleF(74, y, 600, 50));
                    }

                }
                y += 30;
                g.DrawString("来访时间：" + VImodel.VisitTime.ToString().Substring(0, VImodel.VisitTime.ToString

().LastIndexOf(':')), font, Brushes.Black, new RectangleF(5, y, 600, 50));
                y += 30;
                g.DrawString("备注信息：" + VImodel.Comment, font, Brushes.Black, new RectangleF(5, y, 600, 50));
                y += 30;
                g.DrawString("被访人签名：", font, Brushes.Black, new RectangleF(5, y, 200, 50));

                b.IncludeLabel = true;
                Image img = b.Encode(BarcodeLib.TYPE.CODE39, VImodel.V_No, Color.Black, Color.White, 180, 50);
                y += 20;
                g.DrawImage(img, 0, y);
                y += 80;
                g.DrawString("请妥善保管，离开交还门卫", font, Brushes.Black, new RectangleF(5, y, 200, 50));
            }
            catch (Exception ex)
            {
                CommonFunctionClass.ShowMessage("打印时出错，请检查打印设备是否已正确连接");
            }
        } --------------------编程问答--------------------

有没有人知道啊

补充：.NET技术 ,  C#