    protected void createPdfButton_Click(object sender, EventArgs e)
    {
        // Get the PDF Standard
        // By default the Full PDF standard is used
        PdfStandardSubset pdfStandard = PdfStandardSubset.Full;
        if (pdfARadioButton.Checked)
            pdfStandard = PdfStandardSubset.Pdf_A_1b;
        else if (pdfXRadioButton.Checked)
            pdfStandard = PdfStandardSubset.Pdf_X_1a;

        // Get the Color Space
        // By default the RGB color space is used
        ColorSpace pdfColorSpace = ColorSpace.RGB;
        if (grayScaleRadioButton.Checked)
            pdfColorSpace = ColorSpace.Gray;
        else if (cmykRadioButton.Checked)
            pdfColorSpace = ColorSpace.CMYK;

        // Create the PDF document
        Document pdfDocument = null;

        if (pdfStandard == PdfStandardSubset.Full && pdfColorSpace == ColorSpace.RGB)
        {
            // Create a PDF document with default standard and color space
            pdfDocument = new Document();
        }
        else
        {
            // Create a PDF document with the selected standard and color space
            pdfDocument = new Document(pdfStandard, pdfColorSpace);
        }

        // 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=";

        // Get the selected PDF page size
        PdfPageSize pdfPageSize = SelectedPdfPageSize();

        // Get the selected PDF page orientation
        PdfPageOrientation pdfPageOrientation = SelectedPdfPageOrientation();

        // Get the PDF page margins
        Margins pdfPageMargins = new Margins(float.Parse(leftMarginTextBox.Text), float.Parse(rightMarginTextBox.Text),
                float.Parse(topMarginTextBox.Text), float.Parse(bottomMarginTextBox.Text));

        // Create a PDF page in PDF document
        PdfPage firstPdfPage = pdfDocument.AddPage(pdfPageSize, pdfPageMargins, pdfPageOrientation);

        try
        {
            // The URL of the HTML page to convert to PDF
            string urlToConvert = "http://www.evopdf.com";

            // Create the HTML to PDF element
            HtmlToPdfElement htmlToPdfElement = new HtmlToPdfElement(urlToConvert);

            // Optionally set a delay before conversion to allow asynchonous scripts to finish
            htmlToPdfElement.ConversionDelay = 2;

            // Add the HTML to PDF element to PDF document
            firstPdfPage.AddElement(htmlToPdfElement);

            // 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=Create_PDF_Documents.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();
        }
    }