    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;

        Document pdfDocument = null;
        try
        {
            // Convert HTML page or string with mapping attributes to a PDF document object
            // The document can be further modified to highlight the selected elements
            if (convertHtmlRadioButton.Checked)
            {
                string htmlWithMappingAttributes = htmlStringTextBox.Text;
                string baseUrl = baseUrlTextBox.Text;

                // Convert a HTML string with mapping attributes to a PDF document object
                pdfDocument = htmlToPdfConverter.ConvertHtmlToPdfDocumentObject(htmlWithMappingAttributes, baseUrl);
            }
            else
            {
                string url = urlTextBox.Text;

                // Convert a HTML page with mapping attributes to a PDF document object
                pdfDocument = htmlToPdfConverter.ConvertUrlToPdfDocumentObject(url);
            }

            // Display detailed information about the selected elements
            StringBuilder htmlElementInfoBuilder = new StringBuilder();
            foreach (HtmlElementMapping htmlElementInfo in htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementsMappingResult)
            {
                // Get other information about HTML element
                string htmlElementTagName = htmlElementInfo.HtmlElementTagName;
                string htmlElementID = htmlElementInfo.HtmlElementId;
                string htmlElementMappingID = htmlElementInfo.MappingId;
                string htmlElementCssClasssName = htmlElementInfo.HtmlElementCssClassName;
                string htmlElementHtmlCode = htmlElementInfo.HtmlElementOuterHtml;
                string htmlElementInnerHtml = htmlElementInfo.HtmlElementInnerHtml;
                string htmlElementText = htmlElementInfo.HtmlElementText;
                System.Collections.Specialized.NameValueCollection htmlElementAttributes = htmlElementInfo.HtmlElementAttributes;
                HtmlElementPdfRectangle[] htmlElementRectanglesInPdf = htmlElementInfo.PdfRectangles;

                htmlElementInfoBuilder.AppendFormat("<br/>---------------------------------------- HTML Element Info ----------------------------------------<br/><br/>");
                htmlElementInfoBuilder.AppendFormat("<b>Tag Name:</b> {0}<br/>", htmlElementTagName);
                htmlElementInfoBuilder.AppendFormat("<b>Element ID:</b> {0}<br/>", htmlElementID);
                htmlElementInfoBuilder.AppendFormat("<b>Mapping ID:</b> {0}<br/>", htmlElementMappingID);
                htmlElementInfoBuilder.AppendFormat("<b>Text:</b> {0}<br/>", htmlElementText);

                htmlElementInfoBuilder.AppendFormat("<b>Attributes:</b><br/>");
                for (int i = 0; i < htmlElementAttributes.Count; i++)
                    htmlElementInfoBuilder.AppendFormat("&nbsp;&nbsp;&nbsp;{0} = \"{1}\"<br/>", htmlElementAttributes.GetKey(i), htmlElementAttributes.Get(i));

                htmlElementInfoBuilder.AppendFormat("<b>Location in PDF:</b><br/>");
                for (int i = 0; i < htmlElementRectanglesInPdf.Length; i++)
                {
                    PdfPage pdfPage = htmlElementRectanglesInPdf[i].PdfPage;
                    int pdfPageIndex = htmlElementRectanglesInPdf[i].PageIndex;
                    RectangleF rectangleInPdfPage = htmlElementRectanglesInPdf[i].Rectangle;

                    htmlElementInfoBuilder.AppendFormat("&nbsp;&nbsp;&nbsp;PDF Page Index: {0}<br>", pdfPageIndex);
                    htmlElementInfoBuilder.AppendFormat("&nbsp;&nbsp;&nbsp;Rectangle: X = {0:N2} pt , Y = {1:N2} pt , W = {2:N2} pt , H = {3:N2} pt<br/>",
                            rectangleInPdfPage.X, rectangleInPdfPage.Y, rectangleInPdfPage.Width, rectangleInPdfPage.Height);
                }

                htmlElementInfoBuilder.AppendFormat("<br/>");
            }

            PdfPage lastPdfPage = htmlToPdfConverter.ConversionSummary.LastPdfPage;
            RectangleF lastPageRectangle = htmlToPdfConverter.ConversionSummary.LastPageRectangle;

            HtmlToPdfElement htmlElementInfoHtml = new HtmlToPdfElement(0, lastPageRectangle.Bottom + 1, htmlElementInfoBuilder.ToString(), null);
            lastPdfPage.AddElement(htmlElementInfoHtml);

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

            // 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=Select_in_HTML_Elements_to_Retrieve.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
            if (pdfDocument != null)
                pdfDocument.Close();
        }
    }