Execute Acrobat JavaScript Code when a Button is Clicked

protected void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a PDF document
    Document pdfDocument = 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 = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

    // Add a page to PDF document
    PdfPage pdfPage = pdfDocument.AddPage();

    try
    {
        string htmlWithButton = htmlStringTextBox.Text;
        string baseUrl = baseUrlTextBox.Text;

        // Add a HTML string with a button to PDF document
        HtmlToPdfElement htmlToPdfElement = new HtmlToPdfElement(htmlWithButton, baseUrl);
        pdfPage.AddElement(htmlToPdfElement);

        // Get the button location in PDF
        HtmlElementMapping buttonMapping = htmlToPdfElement.HtmlElementsMappingOptions.HtmlElementsMappingResult.GetElementByMappingId("javascript_button");
        if (buttonMapping != null)
        {
            PdfPage buttonPdfPage = buttonMapping.PdfRectangles[0].PdfPage;
            RectangleF buttonRectangle = buttonMapping.PdfRectangles[0].Rectangle;

            // The font used for buttons text in PDF document
            PdfFont buttonTextFont = pdfDocument.AddFont(new Font("Times New Roman", 8, FontStyle.Regular, GraphicsUnit.Point));

            // Create a PDF form button
            PdfFormButton pdfButton = pdfDocument.Form.AddButton(buttonPdfPage, buttonRectangle, "Execute Acrobat JavaScript", buttonTextFont);

            // Set JavaScript action to be executed when the button is clicked
            string javaScript = null;
            if (alertMessageRadioButton.Checked)
            {
                // JavaScript to display an alert mesage 
                javaScript = String.Format("app.alert(\"{0}\")", alertMessageTextBox.Text);
            }
            else if (printDialogRadioButton.Checked)
            {
                // JavaScript to open the print dialog
                javaScript = "print()";
            }
            else if (zoomLevelRadioButton.Checked)
            {
                // JavaScript to set an initial zoom level 
                javaScript = String.Format("zoom={0}", int.Parse(zoomLevelTextBox.Text));
            }

            // Set the JavaScript action
            pdfButton.Action = new PdfActionJavaScript(javaScript);
        }

        // Save the PDF document in a memory buffer
        byte[] outPdfBuffer = 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=Button_JavaScript_Actions.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();
    }
}

Protected Sub convertToPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs)
    ' Create a PDF document
    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 = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c="

    ' Add a page to PDF document
    Dim pdfPage As PdfPage = pdfDocument.AddPage()

    Try
        Dim htmlWithButton As String = htmlStringTextBox.Text
        Dim baseUrl As String = baseUrlTextBox.Text

        ' Add a HTML string with a button to PDF document
        Dim htmlToPdfElement As New HtmlToPdfElement(htmlWithButton, baseUrl)
        pdfPage.AddElement(htmlToPdfElement)

        ' Get the button location in PDF
        Dim buttonMapping As HtmlElementMapping = htmlToPdfElement.HtmlElementsMappingOptions.HtmlElementsMappingResult.GetElementByMappingId("javascript_button")
        If buttonMapping IsNot Nothing Then
            Dim buttonPdfPage As PdfPage = buttonMapping.PdfRectangles(0).PdfPage
            Dim buttonRectangle As RectangleF = buttonMapping.PdfRectangles(0).Rectangle

            ' The font used for buttons text in PDF document
            Dim buttonTextFont As PdfFont = pdfDocument.AddFont(New Font("Times New Roman", 8, FontStyle.Regular, GraphicsUnit.Point))

            ' Create a PDF form button
            Dim pdfButton As PdfFormButton = pdfDocument.Form.AddButton(buttonPdfPage, buttonRectangle, "Execute Acrobat JavaScript", buttonTextFont)

            ' Set JavaScript action to be executed when the button is clicked
            Dim javaScript As String = Nothing
            If alertMessageRadioButton.Checked Then
                ' JavaScript to display an alert mesage 
                javaScript = String.Format("app.alert(""{0}"")", alertMessageTextBox.Text)
            ElseIf printDialogRadioButton.Checked Then
                ' JavaScript to open the print dialog
                javaScript = "print()"
            ElseIf zoomLevelRadioButton.Checked Then
                ' JavaScript to set an initial zoom level 
                javaScript = String.Format("zoom={0}", Integer.Parse(zoomLevelTextBox.Text))
            End If

            ' Set the JavaScript action
            pdfButton.Action = New PdfActionJavaScript(javaScript)
        End If

        ' 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=Button_JavaScript_Actions.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