    protected void convertToPdfButton_Click(object sender, EventArgs e)
    {
        // Create a HTML to PDF converter object with default settings
        HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

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

        // Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed
        // Set this property to 0 if you don't need to wait for such asynchcronous operations to finish
        htmlToPdfConverter.ConversionDelay = 2;

        // Install a handler where you can set header and footer visibility or create a custom header and footer in each page
        htmlToPdfConverter.PrepareRenderPdfPageEvent += new PrepareRenderPdfPageDelegate(htmlToPdfConverter_PrepareRenderPdfPageEvent);

        // Add Header

        // Enable header in the generated PDF document
        htmlToPdfConverter.PdfDocumentOptions.ShowHeader = addHeaderCheckBox.Checked;

        // Optionally add a space between header and the page body
        // The spacing for first page and the subsequent pages can be set independently
        // Leave this option not set for no spacing
        htmlToPdfConverter.PdfDocumentOptions.Y = float.Parse(firstPageSpacingTextBox.Text);
        htmlToPdfConverter.PdfDocumentOptions.TopSpacing = float.Parse(headerSpacingTextBox.Text);

        // Draw header elements
        if (htmlToPdfConverter.PdfDocumentOptions.ShowHeader)
            DrawHeader(htmlToPdfConverter, drawHeaderLineCheckBox.Checked);

        // Add Footer

        // Enable footer in the generated PDF document
        htmlToPdfConverter.PdfDocumentOptions.ShowFooter = addFooterCheckBox.Checked;

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

        // Draw footer elements
        if (htmlToPdfConverter.PdfDocumentOptions.ShowFooter)
            DrawFooter(htmlToPdfConverter, addPageNumbersInFooterCheckBox.Checked, drawFooterLineCheckBox.Checked);

        // Convert the HTML page to a PDF document in a memory buffer
        byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(urlTextBox.Text);

        // 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=HTML_in_Header_Footer.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();
    }

    /// <summary>
    /// The handler for HtmlToPdfConverter.PrepareRenderPdfPageEvent event where you can set the visibility of header and footer
    /// in each page or you can add a custom header or footer in a page
    /// </summary>
    /// <param name="eventParams">The event parameter containin the PDF page to customize before rendering</param>
    void htmlToPdfConverter_PrepareRenderPdfPageEvent(PrepareRenderPdfPageParams eventParams)
    {
        // Set the header visibility in first, odd and even pages
        if (addHeaderCheckBox.Checked)
        {
            if (eventParams.PageNumber == 1)
                eventParams.Page.ShowHeader = showHeaderInFirstPageCheckBox.Checked;
            else if ((eventParams.PageNumber % 2) == 0 && !showHeaderInEvenPagesCheckBox.Checked)
                eventParams.Page.ShowHeader = false;
            else if ((eventParams.PageNumber % 2) == 1 && !showHeaderInOddPagesCheckBox.Checked)
                eventParams.Page.ShowHeader = false;
        }

        // Set the footer visibility in first, odd and even pages
        if (addFooterCheckBox.Checked)
        {
            if (eventParams.PageNumber == 1)
                eventParams.Page.ShowFooter = showFooterInFirstPageCheckBox.Checked;
            else if ((eventParams.PageNumber % 2) == 0 && !showFooterInEvenPagesCheckBox.Checked)
                eventParams.Page.ShowFooter = false;
            else if ((eventParams.PageNumber % 2) == 1 && !showFooterInOddPagesCheckBox.Checked)
                eventParams.Page.ShowFooter = false;
        }
    }

    /// <summary>
    /// Draw the header elements
    /// </summary>
    /// <param name="htmlToPdfConverter">The HTML to PDF Converter object</param>
    /// <param name="drawHeaderLine">A flag indicating if a line should be drawn at the bottom of the header</param>
    private void DrawHeader(HtmlToPdfConverter htmlToPdfConverter, bool drawHeaderLine)
    {
        string headerHtmlUrl = Server.MapPath("~/DemoAppFiles/Input/HTML_Files/Header_HTML.html");

        // Set the header height in points
        htmlToPdfConverter.PdfHeaderOptions.HeaderHeight = 60;

        // Set header background color
        htmlToPdfConverter.PdfHeaderOptions.HeaderBackColor = Color.White;

        // 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
        htmlToPdfConverter.PdfHeaderOptions.AddElement(headerHtml);

        if (drawHeaderLine)
        {
            // Calculate the header width based on PDF page size and margins
            float headerWidth = htmlToPdfConverter.PdfDocumentOptions.PdfPageSize.Width -
                        htmlToPdfConverter.PdfDocumentOptions.LeftMargin - htmlToPdfConverter.PdfDocumentOptions.RightMargin;

            // Calculate header height
            float headerHeight = htmlToPdfConverter.PdfHeaderOptions.HeaderHeight;

            // 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
            htmlToPdfConverter.PdfHeaderOptions.AddElement(headerLine);
        }
    }

    /// <summary>
    /// Draw the footer elements
    /// </summary>
    /// <param name="htmlToPdfConverter">The HTML to PDF Converter 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 DrawFooter(HtmlToPdfConverter htmlToPdfConverter, bool addPageNumbers, bool drawFooterLine)
    {
        string footerHtmlUrl = Server.MapPath("~/DemoAppFiles/Input/HTML_Files/Footer_HTML.html");

        // Set the footer height in points
        htmlToPdfConverter.PdfFooterOptions.FooterHeight = 60;

        // Set footer background color
        htmlToPdfConverter.PdfFooterOptions.FooterBackColor = Color.WhiteSmoke;

        // 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
        htmlToPdfConverter.PdfFooterOptions.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
            htmlToPdfConverter.PdfFooterOptions.AddElement(footerText);
        }

        if (drawFooterLine)
        {
            // Calculate the footer width based on PDF page size and margins
            float footerWidth = htmlToPdfConverter.PdfDocumentOptions.PdfPageSize.Width -
                        htmlToPdfConverter.PdfDocumentOptions.LeftMargin - htmlToPdfConverter.PdfDocumentOptions.RightMargin;

            // 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
            htmlToPdfConverter.PdfFooterOptions.AddElement(footerLine);
        }
    }