Session state lost when creating PDF from URL

Hi

I have a report that is generated by a logged in user using the ExpertPDF htmltopdf

On the live website after the report is written to the response as a binary file the Session state seems to get lost and the user has to log back in.

However on my dev machine using VS2010 and its inbuilt server the session state seems to be maintained fine.

Any ideas ?

See code below to see how the file is sent to the client.

Code:

public static void CreatePDF(string url, string filename, string title)
		{
			PdfConverter pdfConverter = new PdfConverter();

			pdfConverter.LicenseKey = HTMLlicenseKey;

			pdfConverter.PdfDocumentOptions.PdfPageSize = ExpertPdf.HtmlToPdf.PdfPageSize.A4;

			pdfConverter.PdfDocumentOptions.PdfCompressionLevel = PdfCompressionLevel.Normal;

			pdfConverter.PdfDocumentOptions.ShowHeader = false;

			pdfConverter.PdfDocumentOptions.ShowFooter = true;

			pdfConverter.PdfDocumentOptions.LeftMargin = 60;

			pdfConverter.PdfDocumentOptions.RightMargin = 60;

			pdfConverter.PdfDocumentOptions.TopMargin = 45;

			pdfConverter.PdfDocumentOptions.BottomMargin = 35;

			pdfConverter.PdfDocumentOptions.GenerateSelectablePdf = true;



			pdfConverter.PdfFooterOptions.FooterTextColor = Color.Black;

			pdfConverter.PdfHeaderOptions.DrawHeaderLine = false;
			pdfConverter.PdfFooterOptions.DrawFooterLine = false;




			pdfConverter.PdfFooterOptions.ShowPageNumber = true;



			pdfConverter.PdfFooterOptions.PageNumberTextFontSize = 9;
			pdfConverter.PdfFooterOptions.PageNumberTextColor = Color.FromArgb(46, 69, 155);


			pdfConverter.PdfFooterOptions.PageNumberingFormatString = "&p;";
			pdfConverter.PdfFooterOptions.FooterTextFontSize = 9;
			pdfConverter.PdfFooterOptions.FooterText = "© 0to10RM";

			pdfConverter.PdfFooterOptions.FooterTextColor = Color.FromArgb(46, 69, 155);

			pdfConverter.PdfFooterOptions.ShowOnFirstPage = false;

			pdfConverter.AvoidImageBreak = true;


			StringWriter sw = new StringWriter();

			HttpContext.Current.Server.Execute(url, sw);

			string htmlCodeToConvert = sw.GetStringBuilder().ToString();

			MemoryStream report_stream = new MemoryStream();
			pdfConverter.SavePdfFromHtmlStringToStream(htmlCodeToConvert, PDFBaseURL, report_stream);


			string serverPath = HttpContext.Current.Server.MapPath("/library/");
			string appendix_path = serverPath + "WorkshopTemplate.pdf";


			PDFMerge merger = new PDFMerge();
			merger.LicenseKey = MergeLicenseKey;
			merger.AppendPDFStream(report_stream);
			merger.AppendPDFFile(appendix_path);

			byte[] downloadBytes = merger.RenderMergedPDFDocument();

			System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;

			response.Clear();

			response.AddHeader("Content-Type", "binary/octet-stream");

			response.AddHeader("Content-Disposition", "attachment; filename=" + filename + ".pdf" + "; size=" + downloadBytes.Length.ToString());

			response.Flush();

			response.BinaryWrite(downloadBytes);

			response.Flush();

			response.End();
		}