private void Exitbutton_Click(object sender, EventArgs e)
 {
     foreach (CarModel car in DbController.GetCars())
     {
         DbController.SetStatus(car.id, "Free");
     }
     this.Close();
 }
        private void BlockButton_Click(object sender, EventArgs e)
        {
            SelectedCar   = CarGridView.CurrentCell.RowIndex + 1;
            SelectedCarId = Convert.ToInt16(CarGridView.Rows[CarGridView.CurrentCell.RowIndex].Cells["CarId"].Value);

            DbController.SetStatus(SelectedCarId, "Blocked");
            CarGridView.Rows.Clear();
            i = 0;
            foreach (CarModel car in DbController.GetCars())
            {
                if ((DateTime.Compare(Date1, car.date) > 0 || CarCheckBox.Checked) && car.status == "Free")
                {
                    CarGridView.Rows.Add(car.id, car.brand, car.model, car.power, car.seats, car.maxv, car.price, car.gearbox, car.fuel, car.colour);
                }
            }
        }