    private 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 attachments, 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;

        Cursor = Cursors.WaitCursor;

        // Convert HTML to PDF using the settings above
        string outPdfFile = @"DemoAppFiles\Output\HTML_to_PDF\Set_PDF_Viewer_Preferences.pdf";
        try
        {
            // Convert the HTML page to a PDF document in a memory buffer
            byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(urlTextBox.Text);

            // Write the memory buffer in a PDF file
            System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer);
        }
        catch (Exception ex)
        {
            // The HTML to PDF conversion failed
            MessageBox.Show(String.Format("HTML to PDF Error. {0}", ex.Message));
            return;
        }
        finally
        {
            Cursor = Cursors.Arrow;
        }

        // Open the created PDF document in default PDF viewer
        try
        {
            System.Diagnostics.Process.Start(outPdfFile);
        }
        catch (Exception ex)
        {
            MessageBox.Show(String.Format("Cannot open created PDF file '{0}'. {1}", outPdfFile, ex.Message));
        }
    }