private string GetXml()
        {
            string xmlTxt;

            using (var sw = new StringWriter())
            {
                using (var writer = XmlWriter.Create(sw))
                {
                    writer.WriteStartElement("Specification");
                    writer.WriteStartElement("ParameterManager");

                    mParamMgr.WriteXml(writer);

                    writer.WriteEndElement();
                    writer.WriteEndElement();
                }

                xmlTxt = sw.ToString();
            }
            return(xmlTxt);
        }