For Large volume of data,PDF is not getting generated. So I debugged our code and found aspose wrapper class is having issue. Below bolded line of code hangs and it never comes back even after 30 min. Attached the HTMLtoPDF code in zip file as well.
Note: We are generating PDF from html
Aspose.Pdf.Document docx = new Aspose.Pdf.Document(inHtmlStream, htmloptions);
HTMLtoPDF aspose code.zip (1021 Bytes)