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="

    ' 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

    ' Enable the automatic conversion of the HTML form to a PDF form 
    htmlToPdfConverter.PdfFormOptions.AutoPdfFormEnabled = createPdfFormCheckBox.Checked

    ' Set the submit buttons style
    htmlToPdfConverter.PdfFormOptions.SubmitButtonStyle.BackColor = Color.Beige

    ' Set the style of various types of text boxes
    htmlToPdfConverter.PdfFormOptions.TextBoxStyle.BackColor = Color.AliceBlue
    htmlToPdfConverter.PdfFormOptions.PasswordTextBoxStyle.BackColor = Color.MistyRose
    htmlToPdfConverter.PdfFormOptions.MultilineTextBoxStyle.BackColor = Color.AliceBlue

    ' Set the radio buttons style
    htmlToPdfConverter.PdfFormOptions.RadioButtonsGroupStyle.BackColor = Color.AntiqueWhite

    ' Set the checkboxes styles
    htmlToPdfConverter.PdfFormOptions.CheckBoxStyle.BackColor = Color.AntiqueWhite

    ' set the drop down lists style
    htmlToPdfConverter.PdfFormOptions.ComboBoxStyle.BackColor = Color.LightCyan

    Cursor = Cursors.WaitCursor

    Dim outPdfFile As String = "DemoAppFiles\Output\HTML_to_PDF\Auto_Create_PDF_Forms.pdf"
    Try
        Dim outPdfBuffer() As Byte = Nothing

        If convertHtmlRadioButton.Checked Then
            ' Convert a HTML string to a PDF document with form fields
            Dim htmlWithForm As String = htmlStringTextBox.Text
            outPdfBuffer = htmlToPdfConverter.ConvertHtml(htmlWithForm, String.Empty)
        Else
            ' Convert the HTML page to a PDF document with form fields
            Dim url As String = urlTextBox.Text
            outPdfBuffer = htmlToPdfConverter.ConvertUrl(url)
        End If

        ' 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