public Form1()
{
InitializeComponent();
truck = new Truck();
lstTrucks = new List<Truck>();
// can only set allow-drop by code
groupBox1.AllowDrop = true;
}
private void btnAddTruck_Click(object sender, EventArgs e)
{
truck = new Truck(tbxTrNo.Text, tbxDriverName.Text,
tbxDriverLicense.Text, tbxTruckCondition.Text);
lsvTruck.Items.Add(truck.ToString());
}