Protected Sub convertToPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs)
    ' Create a PDF document
    Dim pdfDocument As 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 = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og="

    ' Add a page to PDF document
    Dim pdfPage As 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

    Try
        ' Create a HTML to PDF element to add to document
        Dim htmlToPdfElement As 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
        Dim outPdfBuffer() As Byte = pdfDocument.Save()

        ' 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()
    Finally
        ' Close the PDF document
        pdfDocument.Close()
    End Try
End Sub