private void btnAddVehicle_Click(object sender, EventArgs e)
{
Vehicle vehicle = new Vehicle();
vehicle.registration = tbox_addVehicle_registration.Text;
vehicle.cargoSpace = int.Parse(tbox_addVehicle_CarsoSpace.Text);
vehicle.fuelConsumption = double.Parse(tbox_addVehicle_fuelConsumption.Text);
vehicle.brand = tbox_addVehicle_brand.Text;
vehicle.model = tbox_addVehicle_model.Text;
DeliveryHolder.vehicles.Add(vehicle);
DeliveryClient.InsertVehicle(vehicle);
clearTab(tabPageVehicle);
setupRouteCmb();
}