public IEnumerable <ParameterResponseModel> Get(string lang = "EN") { string _value; switch (lang) { case "TH": _value = ConfigurationManager.AppSettings[nameof(AppSettings.FatcaDescriptionTHValue)].ToString(); break; case "EN": _value = ConfigurationManager.AppSettings[nameof(AppSettings.FatcaDescriptionENValue)].ToString(); break; default: _value = ConfigurationManager.AppSettings[nameof(AppSettings.FatcaDescriptionENValue)].ToString(); break; } AS400AppSettingModel appSetting = new AS400AppSettingModel() { File = ConfigurationManager.AppSettings[nameof(AppSettings.FatcaDescriptionFile)].ToString(), Key = ConfigurationManager.AppSettings[nameof(AppSettings.FatcaDescriptionKey)].ToString(), Value = _value }; return(service.GetFatcaDescription(appSetting)); }