private void updateRentButton_Click(object sender, EventArgs e) { CarService carService = new CarService(); Car car = carRentedList.SelectedItem as Car; DateTime from = carService.ConvertToDate(dateTimePicker1.Value); DateTime to = carService.ConvertToDate(dateTimePicker2.Value); Rent rent = new Rent(car, from, to); Rent currentRent = rentListInAdmin.SelectedItem as Rent; _adminForRent.ChangeRent(currentRent, rent); rentListInAdmin.DataSource = _adminForRent.GetRentForCar(car); }