Protected Sub convertToPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs)
    ' 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()

    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()

        ' 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=Merge_Multipe_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