private XmlDocument AttemptLoadConfiguration(FileInfo configFile)
        {
            XmlValidatingLoader loader = CreateXmlValidatingLoader(configFile);

            try
            {
                return(loader.Load());
            }
            catch (XmlException ex)
            {
                throw new ConfigurationException("The configuration file contains invalid xml: " + configFile.FullName, ex);
            }
            finally
            {
                loader.Dispose();
            }
        }