private bool isValidDateHired(EmployeeCardModel emplCardModel) { bool result = true; using (var db = AppDbContext.GetInstance()) { var regCardDb = new RegisterCardService(db); var regCards = regCardDb.GetItemsByEmployeeName(emplCardModel.Firstname, emplCardModel.Lastname); if (regCards.Length > 0) { result = !regCards.Any(n => n.DateHired >= emplCardModel.DateHired); } } return(result); }