static List <string> CheckNotNullOrEmpty(IAppService appService) { List <string> results = new List <string>(); results.Add(appService.CheckString(null)); results.Add(appService.CheckString(string.Empty)); results.Add(appService.CheckString("str")); results.Add(appService.CheckObject(null)); results.Add(appService.CheckObject(new object())); int?nullableInteger = null; results.Add(appService.CheckNullalble(nullableInteger)); nullableInteger = 1; results.Add(appService.CheckNullalble(nullableInteger)); return(results); }