    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 PDF Viewer Preferences

        // Set page layout to continuous one column, single page, two column left, two column right
        htmlToPdfConverter.PdfViewerPreferences.PageLayout = SelectedPageLayout();
        // Set page mode to default, display bookmarks, display thumbnails, display attachments
        htmlToPdfConverter.PdfViewerPreferences.PageMode = SelectedPageMode();

        // Hide the viewer menu
        htmlToPdfConverter.PdfViewerPreferences.HideMenuBar = hideMenuBarCheckBox.Checked;
        // Hide the viewer toolbar
        htmlToPdfConverter.PdfViewerPreferences.HideToolbar = hideToolbarCheckBox.Checked;
        // Hide scroll bars and navigation controls
        htmlToPdfConverter.PdfViewerPreferences.HideWindowUI = hideWindowUICheckBox.Checked;

        // Display the document title in viewer title bar
        htmlToPdfConverter.PdfViewerPreferences.DisplayDocTitle = displayDocTitleCheckBox.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=Set_PDF_Viewer_Preferences.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();
    }