    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;

        // Set the CSS selectors of the HTML elements for which to avoid page breaks inside in the generated PDF document
        htmlToPdfConverter.PdfDocumentOptions.AvoidHtmlElementsBreakSelectors = new string[] { htmlElementsSelectorTextBox.Text };

        byte[] outPdfBuffer = null;

        if (convertHtmlRadioButton.Checked)
        {
            string htmlWithForm = htmlStringTextBox.Text;
            string baseUrl = baseUrlTextBox.Text;

            // Convert the HTML string to a PDF document in a memory buffer
            outPdfBuffer = htmlToPdfConverter.ConvertHtml(htmlWithForm, baseUrl);
        }
        else
        {
            string url = urlTextBox.Text;

            // Convert the HTML page to a PDF document in a memory buffer
            outPdfBuffer = htmlToPdfConverter.ConvertUrl(url);
        }

        // 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=Avoid_Page_Breaks_Inside_HTML_Elements_Using_API.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();
    }