public void DoAction(string saisie) { switch (saisie.ToUpper()) { case "5": _CityService.AddManyCities(1000000); break; case "6": _CityService.ClearCities(); _CityService.AddManyCities(1000000); break; case "7": _CityService.ClearCities(); break; case "8": _CityService.SaveToFile(@"./cities.csv"); break; } }