    private void createPdfButton_Click(object sender, EventArgs e)
    {
        // Create a PDF document
        Document pdfDocument = new Document();

        // Set license key received after purchase to use the converter in licensed mode
        // Leave it not set to use the converter in demo mode
        pdfDocument.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

        // Add a PDF page to PDF document
        PdfPage pdfPage = pdfDocument.AddPage();

        Cursor = Cursors.WaitCursor;

        string outPdfFile = @"DemoAppFiles\Output\PDF_Creator\Header_Footer_in_External_PDF.pdf";
        try
        {
            // Add a default document header
            AddHeader(pdfDocument, true);

            // Add a default document footer
            AddFooter(pdfDocument, true, true);

            // Create a HTML to PDF element to add to document
            HtmlToPdfElement htmlToPdfElement = new HtmlToPdfElement(0, 0, urlTextBox.Text);

            // Optionally set a delay before conversion to allow asynchonous scripts to finish
            htmlToPdfElement.ConversionDelay = 2;

            // Add HTML to PDF element to document
            pdfPage.AddElement(htmlToPdfElement);

            // Automatically close the external PDF documents after the final document is saved
            pdfDocument.AutoCloseAppendedDocs = true;

            // Insert an external PDF document in the beginning of the final PDF document
            Document startExternalDocument = new Document(pdfBeforeTextBox.Text);
            pdfDocument.InsertDocument(0, startExternalDocument, addHeaderFooterInInsertedPdfCheckBox.Checked,
                            showHeaderInFirstPageCheckBox.Checked, showFooterInFirstPageCheckBox.Checked);

            // Append an external PDF document at the end of the final PDF document
            Document endExternalDocument = new Document(pdfAfterTextBox.Text);
            pdfDocument.AppendDocument(endExternalDocument, addHeaderFooterInAppendedPdfCheckBox.Checked, true, true);

            // Save the PDF document in a memory buffer
            byte[] outPdfBuffer = pdfDocument.Save();

            // Write the memory buffer in a PDF file
            System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer);
        }
        catch (Exception ex)
        {
            // The PDF creation failed
            MessageBox.Show(String.Format("Create PDF Document Error. {0}", ex.Message));
            return;
        }
        finally
        {
            // Close the PDF document
            pdfDocument.Close();

            Cursor = Cursors.Arrow;
        }

        // Open the created PDF document in default PDF viewer
        try
        {
            System.Diagnostics.Process.Start(outPdfFile);
        }
        catch (Exception ex)
        {
            MessageBox.Show(String.Format("Cannot open created PDF file '{0}'. {1}", outPdfFile, ex.Message));
        }
    }

    /// <summary>
    /// Add a header to document
    /// </summary>
    /// <param name="pdfDocument">The PDF document object</param>
    /// <param name="drawHeaderLine">A flag indicating if a line should be drawn at the bottom of the header</param>
    private void AddHeader(Document pdfDocument, bool drawHeaderLine)
    {
        string headerHtmlUrl = System.IO.Path.Combine(Application.StartupPath,
                    @"DemoAppFiles\Input\HTML_Files\Header_HTML.html");

        // Create the document footer template
        pdfDocument.AddHeaderTemplate(60);

        // Create a HTML element to be added in header
        HtmlToPdfElement headerHtml = new HtmlToPdfElement(headerHtmlUrl);

        // Set the HTML element to fit the container height
        headerHtml.FitHeight = true;

        // Add HTML element to header
        pdfDocument.Header.AddElement(headerHtml);

        if (drawHeaderLine)
        {
            float headerWidth = pdfDocument.Header.Width;
            float headerHeight = pdfDocument.Header.Height;

            // Create a line element for the bottom of the header
            LineElement headerLine = new LineElement(0, headerHeight - 1, headerWidth, headerHeight - 1);

            // Set line color
            headerLine.ForeColor = Color.Gray;

            // Add line element to the bottom of the header
            pdfDocument.Header.AddElement(headerLine);
        }
    }

    /// <summary>
    /// Add a footer to document
    /// </summary>
    /// <param name="pdfDocument">The PDF document object</param>
    /// <param name="addPageNumbers">A flag indicating if the page numbering is present in footer</param>
    /// <param name="drawFooterLine">A flag indicating if a line should be drawn at the top of the footer</param>
    private void AddFooter(Document pdfDocument, bool addPageNumbers, bool drawFooterLine)
    {
        string footerHtmlUrl = System.IO.Path.Combine(Application.StartupPath,
                    @"DemoAppFiles\Input\HTML_Files\Footer_HTML.html");

        // Create the document footer template
        pdfDocument.AddFooterTemplate(60);

        // Set footer background color
        RectangleElement backColorRectangle = new RectangleElement(0, 0, pdfDocument.Footer.Width, pdfDocument.Footer.Height);
        backColorRectangle.BackColor = Color.WhiteSmoke;
        pdfDocument.Footer.AddElement(backColorRectangle);

        // Create a HTML element to be added in footer
        HtmlToPdfElement footerHtml = new HtmlToPdfElement(footerHtmlUrl);

        // Set the HTML element to fit the container height
        footerHtml.FitHeight = true;

        // Add HTML element to footer
        pdfDocument.Footer.AddElement(footerHtml);

        // Add page numbering
        if (addPageNumbers)
        {
            // Create a text element with page numbering place holders &p; and & P;
            TextElement footerText = new TextElement(0, 30, "Page &p; of &P;  ",
                new System.Drawing.Font(new System.Drawing.FontFamily("Times New Roman"), 10, System.Drawing.GraphicsUnit.Point));

            // Align the text at the right of the footer
            footerText.TextAlign = HorizontalTextAlign.Right;

            // Set page numbering text color
            footerText.ForeColor = Color.Navy;

            // Embed the text element font in PDF
            footerText.EmbedSysFont = true;

            // Add the text element to footer
            pdfDocument.Footer.AddElement(footerText);
        }

        if (drawFooterLine)
        {
            float footerWidth = pdfDocument.Footer.Width;

            // Create a line element for the top of the footer
            LineElement footerLine = new LineElement(0, 0, footerWidth, 0);

            // Set line color
            footerLine.ForeColor = Color.Gray;

            // Add line element to the bottom of the footer
            pdfDocument.Footer.AddElement(footerLine);
        }
    }