    protected 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();

        try
        {
            // Create the document footer template
            pdfDocument.AddFooterTemplate(50);

            // ----- Add HTML with Page Numbering to Footer -----

            // Create a variable HTML element with page numbering
            string htmlStringWithPageNumbers = htmlWithPageNumbersTextBox.Text;
            string baseUrl = baseUrlTextBox.Text;
            HtmlToPdfVariableElement footerHtmlWithPageNumbers = new HtmlToPdfVariableElement(htmlStringWithPageNumbers, baseUrl);

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

            // Add variable HTML element with page numbering to footer
            pdfDocument.Footer.AddElement(footerHtmlWithPageNumbers);

            // Optionally draw a line at the top of the footer
            if (drawFooterLineCheckBox.Checked)
            {
                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);
            }

            // 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;

            // Optionally add a space between footer and the page body
            // Leave this option not set for no spacing
            htmlToPdfElement.BottomSpacing = float.Parse(footerSpacingTextBox.Text);

            // Add the HTML to PDF element to document
            // This will raise the PrepareRenderPdfPageEvent event where the header and footer visibilit per page can be changed
            pdfPage.AddElement(htmlToPdfElement);

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

            // Write the memory buffer in a PDF file// Send the PDF as response to browser

            // Set response content type
            Response.AddHeader("Content-Type", "application/pdf");

            // Instruct the browser to open the PDF file as an attachment or inline
            Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Page_Numbers_in_HTML.pdf; size={0}", outPdfBuffer.Length.ToString()));

            // Write the PDF document buffer to HTTP response
            Response.BinaryWrite(outPdfBuffer);

            // End the HTTP response and stop the current page processing
            Response.End();
        }
        finally
        {
            // Close the PDF document
            pdfDocument.Close();
        }
    }