How do I add page number on top of combined pdf itextsharp c# winform

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C#

PDF

itextsharp

Hi,

Hi, I want to create a new combined pdf from different pdfs on grid from specific page to end page in the grid. Using the below code I am able to create the combine pdf without any issues. But, this code should also write the original pdf name from the grid at the top left followed by the page number of that page in the original pdf using the following format.

For eg if the current combined page is from the original pdf examplepdf page #10, then it should be written in the following format on the combined pdf in the top left.

(examplepdf-page 10)

But, it is not working. Kindly guide me where I am going wrong.

private void createReviewFiles()
{
    try
    {
        objarraylist = new ArrayList();
        if (dg_codedetails.Rows.Count > 0)
        {
            int pageOffset = 0;
            ArrayList master = new ArrayList();
            int f = 0;
            Document document = null;
            PdfCopy writer = null;

            String pfilename = String.Empty;
            String pdfilename = String.Empty;
            String outputPdfPath = String.Empty;


            DirectoryInfo dirReview = new DirectoryInfo(dir.FullName + "\\" + "ReviewFolder");
            if (!dirReview.Exists)
                dirReview.Create();
            outputPdfPath = dirReview + "\\" + "ReviewFiles.pdf";
            foreach (DataGridViewRow dgr in dg_codedetails.Rows)
            {
                pfilename = dgr.Cells[0].Value.ToString();//pdf file name
                pdfilename = dgr.Cells[7].Value.ToString();// pdf file name in specific format.


                Int16 startvalue = Convert.ToInt16(dgr.Cells[2].Value);//start page #
                Int16 endvalue = Convert.ToInt16(dgr.Cells[3].Value);//end page #


                PdfReader reader = new PdfReader(dir.FullName + "\\" + pfilename);
                reader.ConsolidateNamedDestinations();
                // we retrieve the total number of pages
                int n = reader.NumberOfPages;



                pageOffset += n;
                if (f == 0)
                {
                    // step 1: creation of a document-object
                    document = new Document(reader.GetPageSizeWithRotation(1));
                    // step 2: we create a writer that listens to the document
                    writer = new PdfCopy(document, new FileStream(outputPdfPath, FileMode.Create));
                    // step 3: we open the document
                    document.Open();
                    f += 1;
                }

                TextField tf = new TextField(writer, new iTextSharp.text.Rectangle(1, 1, 100, 300), pdfilename);
                ////Change the orientation of the text
                tf.Rotation = 90;
                writer.AddAnnotation(tf.GetTextField());

                // put the alignment and coordinates here
                cb.ShowTextAligned(1, pdfilename, 1, 1, 0);

                // step 4: we add content
                for (int i = startvalue; i <= endvalue; i++)
                {

                    if (writer != null)
                    {
                        string text = "(" + pfilename.Replace(".pdf", "").Replace(".PDF", "") + "-page " + i + ")";
                        if (!objarraylist.Contains(text))
                            objarraylist.Add(text);
                        PdfContentByte cb = writer.DirectContent;
                        cb.BeginText();
                        cb.SetFontAndSize(BaseFont.CreateFont(), 10f);
                        cb.SetTextMatrix(600, 15);
                        cb.ShowText(pdfilename);
                        cb.EndText();
                        PdfImportedPage page = writer.GetImportedPage(reader, i);
                        OnStartPage(page.PdfWriter, page.PdfDocument, pfilename);
                        writer.AddPage(page);

                    }
                }
                PRAcroForm form = reader.AcroForm;
                if (form != null && writer != null)
                {
                    writer.CopyAcroForm(reader);
                }
            }
            if (document != null)
            {
                document.Close();
            }
          

        }

    }
    catch (Exception ex) { MessageBox.Show(ex.Message); }

}