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 = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og=";

    // 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();
}