while export to pdf using itexsharp it shows blank page - asp.net

Question

i made one desktop application using asp.net which convert html to PDF.
basically this application used for generate users PDF from database.
process: first of all i am converting all data to html and then convert to PDF using itextsharp but after generating some PDFs it shows blank pages
any idea or anyone face this type of issue
public static void converttopdf(string HtmlStream, List<Tuple<string, string>> tifffiles, List<Tuple<string, string>> pdffilestomerge, string filename, string patientfirstpagestr, string TableofContent, string patientheader, SqlConnection con, string sectiondetails)
{
MemoryStream msOutput = new MemoryStream();
TextReader reader = new StringReader(HtmlStream);
Document document = new Document(PageSize.A4, 30, 30, 42, 44);
string filetogenerate = string.Empty;
if (pdffilestomerge != null && pdffilestomerge.Count > 1)
{
filetogenerate = temppath + filename + "_Temp1.pdf";
}
else
{
filetogenerate = temppath + filename + "_Temp.pdf";
}
PdfWriter writer = PdfWriter.GetInstance(document, new System.IO.FileStream(filetogenerate, System.IO.FileMode.Create));
HTMLWorker worker = new HTMLWorker(document);
document.Open();
worker.StartDocument();
string[] separator = new string[] { #"<br clear='all' style='page-break-before:always'>" };
string[] pages = HtmlStream.Split(separator, StringSplitOptions.None);
foreach (string page in pages)
{
document.NewPage();
System.Collections.ArrayList htmlarraylist = HTMLWorker.ParseToList(new StringReader(page), null);
for (int k = 0; k < htmlarraylist.Count; k++)
{
document.Add((IElement)htmlarraylist[k]);
}
}
using (var ms = new MemoryStream())
{
if (tifffiles != null)
{
int docid = 0;
foreach (var obj in tifffiles)
{
string filepath = obj.Item2.ToString();
WriteLogEntry("bitmap file path : " + filepath);
if (filepath != string.Empty)
{
try
{
Bitmap myBitmap = new Bitmap(filepath);
System.Drawing.Color pixelColor = myBitmap.GetPixel(50, 50);
if (pixelColor.Name == "ff808080")
{
WriteLogEntry("convert image by irfanview :" + filepath);
LaunchCommandLineApp(filepath, temppath + "Test.jpg");
document.NewPage();
var imgStream = GetImageStream(temppath + "Test.jpg");
var image = iTextSharp.text.Image.GetInstance(imgStream);
image.SetAbsolutePosition(10, 80);
image.ScaleToFit(document.PageSize.Width - 60, document.PageSize.Height - 80);
//image.ScaleToFit(document.PageSize.Width - 30, document.PageSize.Height);
if (docid != Convert.ToInt32(obj.Item1))
{
Chunk c1 = new Chunk("#~#DID" + obj.Item1.ToString() + "#~#");
c1.Font.SetColor(0, 0, 0); //#00FFFFFF
c1.Font.Size = 0;
document.Add(c1);
}
document.Add(image);
File.Delete(temppath + "Test.jpg");
}
else
{
document.NewPage();
var imgStream = GetImageStream(filepath);
var image = iTextSharp.text.Image.GetInstance(imgStream);
image.SetAbsolutePosition(10, 80);
image.ScaleToFit(document.PageSize.Width - 60, document.PageSize.Height - 80);
//image.ScaleToFit(document.PageSize.Width - 30, document.PageSize.Height);
if (docid != Convert.ToInt32(obj.Item1))
{
Chunk c1 = new Chunk("#~#DID" + obj.Item1.ToString() + "#~#");
c1.Font.SetColor(0, 0, 0); //#00FFFFFF
c1.Font.Size = 0;
document.Add(c1);
}
document.Add(image);
WriteLogEntry("Image added successfully" + filepath);
}
}
catch
{
document.NewPage();
if (docid != Convert.ToInt32(obj.Item1))
{
Chunk c1 = new Chunk("#~#DID" + obj.Item1.ToString() + "#~#");
c1.Font.SetColor(0, 0, 0); //#00FFFFFF
c1.Font.Size = 0;
document.Add(c1);
}
WriteLogEntry("Image not valid" + filepath);
}
docid = Convert.ToInt32(obj.Item1);
}
}
}
}
worker.EndDocument();
worker.Close();
document.Close();
if (pdffilestomerge != null && pdffilestomerge.Count > 1)
{
string file = temppath + filename + "_Temp.pdf";
mergepdf(file, pdffilestomerge, filetogenerate);
}
PdfReader pdfreader = new PdfReader(temppath + filename + "_Temp.pdf");
Document document1 = new Document(PageSize.A4, 30, 30, 42, 44);
PdfWriter writer1 = PdfWriter.GetInstance(document1, new FileStream(FinalOutputPath + filename + ".pdf", FileMode.Create));
//HeaderFooter footer = new HeaderFooter(new Phrase("Page "), true);
//footer.Alignment = Element.ALIGN_RIGHT;
//footer.Border = iTextSharp.text.Rectangle.NO_BORDER;
//document1.Footer = footer;
//HeaderFooter header = new HeaderFooter(new Phrase(""), true);
//header.Alignment = Element.ALIGN_LEFT;
//header.Border = iTextSharp.text.Rectangle.NO_BORDER;
//document1.Add(header);
document1.Open();
PdfContentByte cb1 = writer1.DirectContent;
PdfImportedPage page1;
string test1 = TableofContent; int TableofContentPageCount = 0; int SectionPageStartNumber = 0;
string lastdocnamestr = "";
for (int t = 1; t <= pdfreader.NumberOfPages; t++)
{
document1.NewPage();
HeaderFooter header = new HeaderFooter(new Phrase(""), true);
header.Alignment = Element.ALIGN_LEFT;
header.Border = iTextSharp.text.Rectangle.NO_BORDER;
HeaderFooter header1 = new HeaderFooter(new Phrase(" "), true);
header1.Alignment = Element.ALIGN_LEFT;
header1.Border = iTextSharp.text.Rectangle.NO_BORDER;
HeaderFooter header2 = new HeaderFooter(new Phrase(" "), true);
header2.Alignment = Element.ALIGN_LEFT;
header2.Border = iTextSharp.text.Rectangle.NO_BORDER;
document1.Add(header);
document1.Add(header1);
document1.Add(header2);
page1 = writer1.GetImportedPage(pdfreader, t);
var baseFont = BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
byte[] pdfcontent = pdfreader.GetPageContent(t);
//PdfDictionary dict = pdfreader.GetPageN(t);
string contentStream = System.Text.Encoding.Default.GetString(pdfcontent);
var contentByte = writer1.DirectContent;
contentByte.BeginText();
contentByte.SetFontAndSize(baseFont, 8);
var multiLineString = "";
var multiLineString1 = "";
string test = getBetween(contentStream, "#~#", "#~#");
if (test.Length > 0)
{
test1 = test1.Replace(test + ".", t.ToString());
DataTable dt = getdocdetailforheader(Convert.ToInt32(test.Replace("DID", "")), con);
if (dt.Rows.Count > 0)
{
multiLineString = dt.Rows[0]["DocumentName"].ToString() + " - " + Convert.ToDateTime(dt.Rows[0]["EncounterDTTM"].ToString()).ToString("MM/dd/yyyy") + " | Owner : " + dt.Rows[0]["Ownername"].ToString();
lastdocnamestr = multiLineString;
WriteLogEntry(multiLineString);
}
if (TableofContentPageCount == 0)
{
TableofContentPageCount = t;
}
}
//if (contentStream.Contains("sectionstart") && SectionPageStartNumber == 0) SectionPageStartNumber = t;
if (lastdocnamestr != string.Empty)
{
multiLineString = lastdocnamestr;
}
//else
//{
// if (TableofContentPageCount == 0)
// {
// multiLineString = "Table of Content";
// }
//}
multiLineString1 = patientheader;
contentByte.ShowTextAligned(PdfContentByte.ALIGN_LEFT, multiLineString, 15, 820, 0);
contentByte.ShowTextAligned(PdfContentByte.ALIGN_LEFT, multiLineString1, 15, 810, 0);
contentByte.EndText();
string relLogo = Directory.GetCurrentDirectory().ToString().Replace("bin", "").Replace("Debug", "").Replace("\\\\", "") + "\\Image\\MFA_LOGO.png";
iTextSharp.text.Image jpg = iTextSharp.text.Image.GetInstance(relLogo);
jpg.ScaleAbsolute(38f, 38f);
jpg.SetAbsolutePosition(document1.PageSize.Width - 70, 806);
jpg.Alignment = Element.ALIGN_RIGHT;
document1.Add(jpg);
cb1.MoveTo(0, 805);
cb1.LineTo(document1.PageSize.Width, 805);
cb1.Stroke();
cb1.AddTemplate(page1, 0, 0);
}
SectionPageStartNumber = pdfreader.NumberOfPages + 1;
System.Collections.ArrayList htmlarraylist1 = HTMLWorker.ParseToList(new StringReader(sectiondetails), null);
document1.NewPage();
for (int k = 0; k < htmlarraylist1.Count; k++)
{
document1.Add((IElement)htmlarraylist1[k]);
}
document1.Close();
FinalPDF(FinalOutputPath + filename + ".pdf", FinalOutputPath + filename + "_1.pdf", patientfirstpagestr, test1, TableofContentPageCount, patientheader, SectionPageStartNumber);
File.Delete(temppath + filename + "_Temp.pdf");