Protected Sub createPdfButton_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 PDF page to PDF document
    Dim pdfPage As PdfPage = pdfDocument.AddPage()

    Try
        ' Create the document footer template
        pdfDocument.AddFooterTemplate(50)

        ' ----- Add HTML with Page Numbering to Footer -----

        ' Create a variable HTML element with page numbering
        Dim htmlStringWithPageNumbers As String = htmlWithPageNumbersTextBox.Text
        Dim baseUrl As String = baseUrlTextBox.Text
        Dim footerHtmlWithPageNumbers As New HtmlToPdfVariableElement(htmlStringWithPageNumbers, baseUrl)

        ' Set the HTML element to fit the container height
        footerHtmlWithPageNumbers.FitHeight = True

        ' Add variable HTML element with page numbering to footer
        pdfDocument.Footer.AddElement(footerHtmlWithPageNumbers)

        ' Optionally draw a line at the top of the footer
        If drawFooterLineCheckBox.Checked Then
            Dim footerWidth As Single = pdfDocument.Footer.Width

            ' Create a line element for the top of the footer
            Dim footerLine As New LineElement(0, 0, footerWidth, 0)

            ' Set line color
            footerLine.ForeColor = Color.Gray

            ' Add line element to the bottom of the footer
            pdfDocument.Footer.AddElement(footerLine)
        End If

        ' Create a HTML to PDF element to add to document
        Dim htmlToPdfElement As New HtmlToPdfElement(0, 0, urlTextBox.Text)

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

        ' Optionally add a space between footer and the page body
        ' Leave this option not set for no spacing
        htmlToPdfElement.BottomSpacing = Single.Parse(footerSpacingTextBox.Text)

        ' Add the HTML to PDF element to document
        ' This will raise the PrepareRenderPdfPageEvent event where the header and footer visibilit per page can be changed
        pdfPage.AddElement(htmlToPdfElement)

        ' Save the PDF document in a memory buffer
        Dim outPdfBuffer() As Byte = pdfDocument.Save()

        ' Write the memory buffer in a PDF file// 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=Page_Numbers_in_HTML.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