private 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 = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og=";

    // 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);
            
    Cursor = Cursors.WaitCursor;

    // The output PDF file
    string outPdfFile = @"DemoAppFiles\Output\PDF_Creator\Create_PDF_Documents.pdf";
    try
    {
        // The URL of the HTML page to convert to PDF
        string urlToConvert = "http://www.winnovative-software.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();

        // Write the memory buffer in a PDF file
        System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer);
    }
    catch (Exception ex)
    {
        // The PDF creation failed
        MessageBox.Show(String.Format("Create PDF Document Error. {0}", ex.Message));
        return;
    }
    finally
    {
        // Close the PDF document
        pdfDocument.Close();

        Cursor = Cursors.Arrow;
    }
                            
    // Open the created PDF document in default PDF viewer
    try
    {
        System.Diagnostics.Process.Start(outPdfFile);
    }
    catch (Exception ex)
    {
        MessageBox.Show(String.Format("Cannot open created PDF file '{0}'. {1}", outPdfFile, ex.Message));
    }
}