Private Sub convertToPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles convertToPdfButton.Click
    ' Create a HTML to PDF converter object with default settings
    Dim htmlToPdfConverter As 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="

    ' Enable footer in the generated PDF document
    htmlToPdfConverter.PdfDocumentOptions.ShowFooter = True

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

    ' Set the footer height in points
    htmlToPdfConverter.PdfFooterOptions.FooterHeight = 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
    htmlToPdfConverter.PdfFooterOptions.AddElement(footerHtmlWithPageNumbers)

    ' Optionally draw a line at the top of the footer
    If drawFooterLineCheckBox.Checked Then
        ' Calculate the footer width based on PDF page size and margins
        Dim footerWidth As Single = htmlToPdfConverter.PdfDocumentOptions.PdfPageSize.Width - htmlToPdfConverter.PdfDocumentOptions.LeftMargin - htmlToPdfConverter.PdfDocumentOptions.RightMargin

        ' 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
        htmlToPdfConverter.PdfFooterOptions.AddElement(footerLine)
    End If

    Cursor = Cursors.WaitCursor

    ' Convert HTML to PDF using the settings above
    Dim outPdfFile As String = "DemoAppFiles\Output\HTML_to_PDF\Page_Numbers_in_HTML.pdf"
    Try
        ' Convert the HTML page to a PDF document in a memory buffer
        Dim outPdfBuffer() As Byte = htmlToPdfConverter.ConvertUrl(urlTextBox.Text)

        ' Write the memory buffer in a PDF file
        System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer)
    Catch ex As Exception
        ' The HTML to PDF conversion failed
        MessageBox.Show(String.Format("HTML to PDF Error. {0}", ex.Message))
        Return
    Finally
        Cursor = Cursors.Arrow
    End Try

    ' Open the created PDF document in default PDF viewer
    Try
        Process.Start(outPdfFile)
    Catch ex As Exception
        MessageBox.Show(String.Format("Cannot open created PDF file '{0}'. {1}", outPdfFile, ex.Message))
    End Try
End Sub