GDI+ 发生一般性错误

for (int i = 0; i < barCodeArray.Length; i++)
            {

                string barCode = barCodeArray[i];

                Code39 _Code39 = new Code39();
                _Code39.Height = 45;
                _Code39.Magnify = 0;
                _Code39.ViewFont = new Font("宋体", 10);
                System.Drawing.Image _CodeImage = _Code39.GetCodeImage(barCode, Code39.Code39Model.Code39Normal, true);
                _Stream = new ();
               // _CodeImage.Save(_Stream, System.Drawing.Imaging.ImageFormat.Jpeg);
                System.Drawing.Bitmap _newImage = new Bitmap(_CodeImage.Width, _CodeImage.Height);
                Graphics copy = Graphics.FromImage(_newImage);
                copy.DrawImage(_CodeImage, 0, 0);
                string p = Server.MapPath("BarCode");
                string n = Guid.NewGuid().ToString();
                string saveUrl = p + "/" + n + ".jpeg";

                _CodeImage.Dispose();
                _Stream.Close();
                _newImage.Save(saveUrl); //报错GDI+发生一般性错误
                _newImage.Dispose();
               

                System.Web.UI.WebControls.Image webImg = new System.Web.UI.WebControls.Image();
                webImg.Height = _CodeImage.Height;
                webImg.Width = _CodeImage.Width;
                webImg.ImageUrl = "BarCode/" + n + ".jpeg";
                //webImg.ImageUrl = "BarCode/" + n + ".png";

                TableRow tabRow = new TableRow();
                table.Rows.Add(tabRow);
                TableCell imgCell = new TableCell();
                imgCell.Controls.Add(webImg);
                tabRow.Cells.Add(imgCell);
            }

            this.Controls.Add(table);