itextsharp trimming pdf document's pages

Question

I have a pdf document that has form fields that I\'m filling out programatically with c#. Depending on three conditions, I need to trim (delete) some of the pages from that

Answer 1

Here is the code I use to copy all but the last page of an existing PDF. Everything is in memory streams. The variable pdfByteArray is a byte[] of the original pdf obtained using ms.ToArray(). pdfByteArray is overwritten with the new PDF.

        PdfReader originalPDFReader = new PdfReader(pdfByteArray);

        using (MemoryStream msCopy = new MemoryStream())
        {
           using (Document docCopy = new Document())
           {
              using (PdfCopy copy = new PdfCopy(docCopy, msCopy))
              {
                 docCopy.Open();
                 for (int pageNum = 1; pageNum <= originalPDFReader.NumberOfPages - 1; pageNum ++)
                 {
                    copy.AddPage(copy.GetImportedPage(originalPDFReader, pageNum ));
                 }
                 docCopy.Close();
              }
           }

           pdfByteArray = msCopy.ToArray();