Edit PDF Documents

private void buttonEditPdf_Click_1(object sender, EventArgs e)
{
    // the path PDF document to edit
    string pdfDocumentToEdit = Application.StartupPath + @"\DemoFiles\Pdf\WikiPdf.pdf";

    // load the PDF document to edit
    PdfDocument document = PdfDocument.FromFile(pdfDocumentToEdit);

    #region Add an orange border to each page of the loaded PDF document

    // add an orange border to each PDF page in the loaded PDF document
    foreach (PdfPage pdfPage in document.Pages)
    {
        float crtPdfPageWidth = pdfPage.Size.Width;
        float crtPdfPageHeight = pdfPage.Size.Height;

        // create a PdfRectangle object
        PdfRectangle pdfRectangle = new PdfRectangle(2, 2, crtPdfPageWidth - 4, crtPdfPageHeight - 4);
        pdfRectangle.LineStyle.LineWidth = 2;
        pdfRectangle.ForeColor = Color.OrangeRed;

        // layout the rectangle in PDF page
        pdfPage.Layout(pdfRectangle);
    }

    #endregion Add an orange border to each page of the loaded PDF document

    #region Layout HTML in a canvas to be repeated on each page of the loaded PDF document

    PdfPage pdfPage1 = document.Pages[0];
    float pdfPageWidth = pdfPage1.Size.Width;
    float pdfPageHeight = pdfPage1.Size.Height;

    // the width of the HTML logo in pixels
    int htmlLogoWidthPx = 400;
    // the width of the HTML logo in points
    float htmlLogoWidthPt = PdfDpiTransform.FromPixelsToPoints(htmlLogoWidthPx);
    float htmlLogoHeightPt = 100;

    // create a canvas to be repeated in the center of each PDF page
    // the canvas is a PDF container that can contain PDF objects ( HTML, text, images, etc )
    PdfRepeatCanvas repeatedCanvas = document.CreateRepeatedCanvas(new RectangleF((pdfPageWidth - htmlLogoWidthPt) / 2, (pdfPageHeight - htmlLogoHeightPt) / 2,
                htmlLogoWidthPt, htmlLogoHeightPt));

    // the HTML file giving the content to be placed in the repeated canvas
    string htmlFile = Application.StartupPath + @"\DemoFiles\Html\Logo.Html";

    // the HTML object to be laid out in repeated canvas
    PdfHtml htmlLogo = new PdfHtml(0, 0, repeatedCanvas.Width, repeatedCanvas.Height, htmlFile);
    // the browser width when rendering the HTML
    htmlLogo.BrowserWidth = htmlLogoWidthPx;
    // the HTML content will fit the destination hight which is the same with repeated canvas height
    htmlLogo.FitDestHeight = true;

    // layout the HTML object in the repeated canvas
    PdfLayoutInfo htmlLogLayoutInfo = repeatedCanvas.Layout(htmlLogo);

    #endregion Layout HTML in a canvas to be repeated on each page of the loaded PDF document

    Cursor = Cursors.WaitCursor;
    string pdfFile = Application.StartupPath + @"\DemoOutput\EditPdf.pdf";
    try
    {
        document.WriteToFile(pdfFile);
    }
    catch (Exception ex)
    {
        MessageBox.Show(String.Format("Cannot create the PDF document. {0}", ex.Message));
        return;
    }
    finally
    {
        document.Close();
        Cursor = Cursors.Arrow;
    }

    // open the created PDF document
    try
    {
        System.Diagnostics.Process.Start(pdfFile);
    }
    catch (Exception ex)
    {
        MessageBox.Show(String.Format("The PDF document was created but cannot open '{0}'. {1}", pdfFile, ex.Message));
    }
}