    private void convertToPdfButton_Click(object sender, EventArgs e)
    {
        // Create a PDF document
        Document pdfDocument = new Document();

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

        // Add a page to PDF document
        PdfPage pdfPage = pdfDocument.AddPage();

        // Set the PDF Viewer Preferences

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

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

        // Display the document title in viewer title bar
        pdfDocument.ViewerPreferences.DisplayDocTitle = displayDocTitleCheckBox.Checked;

        Cursor = Cursors.WaitCursor;

        string outPdfFile = @"DemoAppFiles\Output\PDF_Creator\Set_PDF_Viewer_Preferences.pdf";
        try
        {
            // Create a HTML to PDF element to add to document
            HtmlToPdfElement htmlToPdfElement = new HtmlToPdfElement(urlTextBox.Text);

            // Optionally set a delay before conversion to allow asynchonous scripts to finish
            htmlToPdfElement.ConversionDelay = 2;

            // Add the HTML to PDF element to document
            pdfPage.AddElement(htmlToPdfElement);

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

            // Write the memory buffer in a PDF file
            System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer);
        }
        catch (Exception ex)
        {
            // The PDF creation failed
            MessageBox.Show(String.Format("Create PDF Document Error. {0}", ex.Message));
            return;
        }
        finally
        {
            // Close the PDF document
            pdfDocument.Close();

            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));
        }
    }