updated a config file appsetting

updated a config file appsetting

  private static Configuration GetAppConfigFile()
        {
            string appPath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
            string configFile = System.IO.Path.Combine(appPath, System.AppDomain.CurrentDomain.FriendlyName + ".config");

            ExeConfigurationFileMap configFileMap = new ExeConfigurationFileMap()
            {
                ExeConfigFilename = configFile
            };
            
            return ConfigurationManager.OpenMappedExeConfiguration(configFileMap, ConfigurationUserLevel.None);
        }