Using Windows Service - Generate Pdf

void tmrPdfInterval_Tick(object sender, System.Timers.ElapsedEventArgs e)
        {
                System.Guid guid = System.Guid.NewGuid();
                String PdfId = guid.ToString();
                SqlDataAdapter adptr = new SqlDataAdapter("select firstname,middlename,lastname,email from userdetails", con);
                DataSet ds = new DataSet();
                adptr.Fill(ds, "userdetails");

                iTextSharp.text.Document doc = new iTextSharp.text.Document(iTextSharp.text.PageSize.LETTER, 10, 10, 42, 35);
                //iTextSharp.text.pdf.PdfWriter wri = iTextSharp.text.pdf.PdfWriter.GetInstance(doc, new FileStream(@"D:\Service\Pdf\" + PdfId + ".pdf", FileMode.OpenOrCreate));
                iTextSharp.text.pdf.PdfWriter wri = iTextSharp.text.pdf.PdfWriter.GetInstance(doc, new FileStream(@"D:\Service\Pdf\StartPdf.pdf", FileMode.OpenOrCreate));
                doc.AddAuthor("Rahul");
                doc.AddSubject("Rahul Test Windows Service pdf generator");
                doc.AddTitle("This a testing by Rahul");

                doc.Open();

                iTextSharp.text.Cell lineBreak = new iTextSharp.text.Cell("\n");
                lineBreak.Colspan = 8;

                iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(@"D:\Service\SampleWindowsService\SampleWindowsService\Images\redcolor.GIF");
                img.ScalePercent(135, 15);
                iTextSharp.text.Cell lineImage = new iTextSharp.text.Cell(img);
                lineImage.Colspan = 8;

                iTextSharp.text.Cell ContentCell;
                iTextSharp.text.Table personalTable;

                personalTable = new iTextSharp.text.Table(8);
                personalTable.BorderColor = iTextSharp.text.Color.WHITE;

                personalTable.BackgroundColor = iTextSharp.text.Color.PINK;
                personalTable.DefaultCellBorderColor = iTextSharp.text.Color.WHITE;

                ContentCell = new iTextSharp.text.Cell();
                ContentCell.Add(new iTextSharp.text.Paragraph("THIS IS A WINDOWS SERVICE TEST FOR IIE TEAM 123", iTextSharp.text.FontFactory.GetFont(iTextSharp.text.FontFactory.TIMES_BOLD, 12)));
                ContentCell.Colspan = 8;
                ContentCell.SetHorizontalAlignment("center");

                Cell cell1 = new Cell();
                cell1.BorderColor = Color.PINK;
                cell1.BackgroundColor = Color.PINK;
                cell1.Add(new Paragraph("*************************************************", FontFactory.GetFont(FontFactory.HELVETICA, 10u)));
                cell1.Colspan = 8;
                cell1.SetHorizontalAlignment("center");
                personalTable.AddCell(ContentCell);
                personalTable.AddCell(cell1);
  
                doc.Add(personalTable);

                personalTable = new iTextSharp.text.Table(8);
                personalTable.BorderColor = iTextSharp.text.Color.WHITE;
                personalTable.DefaultCellBorderColor = iTextSharp.text.Color.WHITE;

                personalTable.AddCell(lineBreak);
                ContentCell = new iTextSharp.text.Cell();
                ContentCell.Add(new iTextSharp.text.Paragraph("Applicant Data", iTextSharp.text.FontFactory.GetFont(iTextSharp.text.FontFactory.TIMES_BOLD, 11)));
                ContentCell.Colspan = 8;
                ContentCell.SetHorizontalAlignment("left");

                personalTable.AddCell(ContentCell);


                personalTable.AddCell(lineBreak);
                ContentCell = new iTextSharp.text.Cell();
                ContentCell.Add(new iTextSharp.text.Paragraph("Personal Information", iTextSharp.text.FontFactory.GetFont(iTextSharp.text.FontFactory.TIMES_BOLDITALIC, 11)));
                ContentCell.Colspan = 8;
                ContentCell.SetHorizontalAlignment("left");

                personalTable.AddCell(ContentCell);
                doc.Add(personalTable);

                personalTable = new iTextSharp.text.Table(8);
                personalTable.BorderColor = iTextSharp.text.Color.WHITE;
                personalTable.DefaultCellBorderColor = iTextSharp.text.Color.WHITE;
                personalTable.AddCell(lineBreak);
                personalTable.AddCell(lineImage);

                doc.Add(personalTable);

                personalTable = new iTextSharp.text.Table(8);
                personalTable.BorderColor = iTextSharp.text.Color.WHITE;
                personalTable.DefaultCellBorderColor = iTextSharp.text.Color.WHITE;

                ContentCell = new iTextSharp.text.Cell();
                ContentCell.Add(new iTextSharp.text.Paragraph("First Name", iTextSharp.text.FontFactory.GetFont(iTextSharp.text.FontFactory.TIMES_BOLD, 11)));
                ContentCell.Colspan = 2;
                ContentCell.SetHorizontalAlignment("left");
                personalTable.AddCell(ContentCell);

                ContentCell = new iTextSharp.text.Cell();
                ContentCell.Add(new iTextSharp.text.Paragraph("Middle Initial", iTextSharp.text.FontFactory.GetFont(iTextSharp.text.FontFactory.TIMES_BOLD, 11)));
                ContentCell.Colspan = 2;
                ContentCell.SetHorizontalAlignment("left");
                personalTable.AddCell(ContentCell);

                ContentCell = new iTextSharp.text.Cell();
                ContentCell.Add(new iTextSharp.text.Paragraph("Last Name", iTextSharp.text.FontFactory.GetFont(iTextSharp.text.FontFactory.TIMES_BOLD, 11)));
                ContentCell.Colspan = 2;
                ContentCell.SetHorizontalAlignment("left");
                personalTable.AddCell(ContentCell);

                ContentCell = new iTextSharp.text.Cell();
                ContentCell.Add(new iTextSharp.text.Paragraph("Email Address", iTextSharp.text.FontFactory.GetFont(iTextSharp.text.FontFactory.TIMES_BOLD, 11)));
                ContentCell.Colspan = 2;
                ContentCell.SetHorizontalAlignment("center");
                personalTable.AddCell(ContentCell);

                
                doc.Add(personalTable);
         
                doc.Close();
                
            }