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);
}
