public static void Export(string htmlPath, string licenseKey)
        {
            // Convert HTML string to RTF file.
            // If you need more information about HTML-to-RTF Pro DLL .Net email us at:
            // support[at]sautinsoft.com
            SautinSoft.HtmlToRtf h = new SautinSoft.HtmlToRtf();

            // Please insert your serial number here after purchasing the component
            h.Serial = licenseKey;

            string htmlString = "";
            string rtfPath    = Path.ChangeExtension(htmlPath, ".rtf");

            // Get HTML string from a file.
            htmlString = File.ReadAllText(htmlPath);

            // Set 'BaseUrl' that component can find a full path to .css and images
            h.BaseURL = System.IO.Path.GetDirectoryName(System.IO.Path.GetFullPath(htmlPath));

            //h.PreserveFontColor = false;
            h.PreserveBackgroundColor = false;
            h.PreserveFontSize        = true;

            //h.FontSize = 12;

            //SautinSoft.HtmlToRtf.CFont

            // Invoke the method to convert HTML string into RTF file.
            int ret = h.ConvertStringToFile(htmlString, rtfPath);

            // 0 - converting successfully
            // 1 - can't open input file or URL, check the input path
            // 2 - can't create output file, check the output path
            // 3 - converting failed

            /*if (ret == 0)
             * {
             *  // Show produced RTF file
             *  System.Diagnostics.Process.Start(rtfPath);
             * }*/
        }