//
        //  adds extra commentary to the document
        //
        public Document genCommentary(string commentary, string author, string function)
        {
            Document docWithCommentary = new Document();
            // docWithCommentary = this.doc;
            docWithCommentary = doc.Clone();
            Section sectionCommentary = docWithCommentary.AddSection();

            Paragraph paragraph = new Paragraph();
            paragraph = sectionCommentary.AddParagraph("Adviesrapport", "Adviesrapport");
            paragraph = sectionCommentary.AddParagraph(commentary, "Normal");
            paragraph = sectionCommentary.AddParagraph(author + ',', "Normal");
            paragraph = sectionCommentary.AddParagraph(function, "writerFunction");

            return docWithCommentary;
        }

        //                                         
        //  render and stream PDF document
        //
        public MemoryStream renderandStreamPDF(Document docWithCommentary)
        {
            PdfDocumentRenderer renderer = new PdfDocumentRenderer();
           
            if (docWithCommentary == null)
            {
                renderer.Document = this.doc;
            } else
            {
                renderer.Document = docWithCommentary;
            }
         
            renderer.RenderDocument();

            MemoryStream stream = new MemoryStream();
            renderer.PdfDocument.Save(stream, false);
            return stream;
        }

 //
        //  adds extra commentary to the document
        //
        public Document genCommentary(string commentary, string author, string function)
        {
            Document docWithCommentary = new Document();
            // copy contents of previous document
            foreach (Section section in this.doc.Sections)
            {
                Section copiedSection = section.Clone();
                docWithCommentary.Add(copiedSection);
            }
            // clear old doc after copy
            doc = null;

            Section sectionCommentary = docWithCommentary.AddSection();

            Paragraph paragraph = new Paragraph();
            paragraph = sectionCommentary.AddParagraph("Adviesrapport", "InvolvedSystemsHeader");
            paragraph = sectionCommentary.AddParagraph(commentary, "Normal");
            paragraph = sectionCommentary.AddParagraph(author + ',', "Normal");
            paragraph = sectionCommentary.AddParagraph(function, "writerFunction");

            return docWithCommentary;
        }

        //                                         
        //  saves the PDF as a file to the system
        //
        public MemoryStream renderandStreamPDF(Document docWithCommentary)
        {
            renderer = new PdfDocumentRenderer();
           
            if (docWithCommentary == null)
            {
                renderer.Document = this.doc;
            } else
            {
                renderer.Document = docWithCommentary;
            }
         
            renderer.RenderDocument();

            MemoryStream stream = new MemoryStream();
            renderer.PdfDocument.Save(stream, false);
            return stream;
        }