Private Sub convertToPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles convertToPdfButton.Click
    ' Create the PDF document where to add the HTML documents
    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="

    ' Create a PDF page where to add the first HTML
    Dim firstPdfPage As PdfPage = pdfDocument.AddPage()

    Cursor = Cursors.WaitCursor
    Dim outPdfFile As String = "DemoAppFiles\Output\HTML_to_PDF\Merge_Multipe_HTML.pdf"
    Try
        ' Create the first HTML to PDF element
        Dim firstHtml As New HtmlToPdfElement(0, 0, firstUrlTextBox.Text)

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

        ' Add the first HTML to PDF document
        Dim firstAddResult As AddElementResult = firstPdfPage.AddElement(firstHtml)

        Dim secondPdfPage As PdfPage = Nothing
        Dim secondHtmlLocation As PointF = Point.Empty

        If startNewPageCheckBox.Checked Then
            ' Create a PDF page where to add the second HTML
            secondPdfPage = pdfDocument.AddPage()
            secondHtmlLocation = PointF.Empty
        Else
            ' Add the second HTML on the PDF page where the first HTML ended
            secondPdfPage = firstAddResult.EndPdfPage
            secondHtmlLocation = New PointF(firstAddResult.EndPageBounds.Left, firstAddResult.EndPageBounds.Bottom)
        End If

        ' Create the second HTML to PDF element
        Dim secondHtml As New HtmlToPdfElement(secondHtmlLocation.X, secondHtmlLocation.Y, secondUrlTextBox.Text)

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

        ' Add the second HTML to PDF document
        secondPdfPage.AddElement(secondHtml)

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

        ' 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
        ' Close the PDF document
        pdfDocument.Close()

        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