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

    ' Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed
    ' Set this property to 0 if you don't need to wait for such asynchcronous operations to finish
    htmlToPdfConverter.ConversionDelay = 2

    ' Set the CSS selectors of the HTML elements before which to insert page breaks
    htmlToPdfConverter.PdfDocumentOptions.PageBreakBeforeHtmlElementsSelectors = New String() {htmlElementsBeforeSelectorTextBox.Text}

    ' Set the CSS selectors of the HTML elements after which to insert page breaks
    htmlToPdfConverter.PdfDocumentOptions.PageBreakAfterHtmlElementsSelectors = New String() {htmlElementsAfterSelectorTextBox.Text}

    Dim outPdfBuffer() As Byte = Nothing

    If convertHtmlRadioButton.Checked Then
        Dim htmlWithForm As String = htmlStringTextBox.Text
        Dim baseUrl As String = baseUrlTextBox.Text

        ' Convert the HTML string to a PDF document in a memory buffer
        outPdfBuffer = htmlToPdfConverter.ConvertHtml(htmlWithForm, baseUrl)
    Else
        Dim url As String = urlTextBox.Text

        ' Convert the HTML page to a PDF document in a memory buffer
        outPdfBuffer = htmlToPdfConverter.ConvertUrl(url)
    End If

    ' 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=Insert_Page_Breaks_Before_After_HTML_Elements_Using_API.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()
End Sub