Merging Memory Streams to create a http PDF response in c#

Question

I am trying to merge 2 crystal reports into single pdf file and I\'m using Itextsharp v5.1.1. But it says the document cannot be opened. It might be corrupted. There are no

Answer 1

Here's a simple merge method that copies PDF files into one PDF. I use this method quite often when merging pdfs. Hope it helps.

    public MemoryStream MergePdfForms(List<byte[]> files)
    {
        if (files.Count > 1)
        {
            PdfReader pdfFile;
            Document doc;
            PdfWriter pCopy;
            MemoryStream msOutput = new MemoryStream();

            pdfFile = new PdfReader(files[0]);

            doc = new Document();
            pCopy = new PdfSmartCopy(doc, msOutput);

            doc.Open();

            for (int k = 0; k < files.Count; k++)
            {
                pdfFile = new PdfReader(files[k]);
                for (int i = 1; i < pdfFile.NumberOfPages + 1; i++)
                {
                    ((PdfSmartCopy)pCopy).AddPage(pCopy.GetImportedPage(pdfFile, i));
                }
                pCopy.FreeReader(pdfFile);
            }

            pdfFile.Close();
            pCopy.Close();
            doc.Close();

            return msOutput;
        }
        else if (files.Count == 1)
        {
            return new MemoryStream(files[0]);
        }

        return null;
    }

Step 4 try:

        rptCS.Close();
        rptCS.Dispose();
        rptAd.Close();
        rptAd.Dispose();

        Response.Clear();
        Response.ContentType = "application/pdf";
        Response.AddHeader("Content-Disposition", 
    "attachment; filename=" + 
    "Application of " + FullName.Trim() + ".pdf");
        Response.BinaryWrite(ms.ToArray());
        ApplicationInstance.CompleteRequest();