public ActiveSession(ParkingManager pm, User user) { InitializeComponent(); parkingManager = pm; this.user = user; var active = pm.Active_Session(user); if (active == null) { MessageBox.Show("Acrive session does not exist"); Close(); } else { Time.Text = (DateTime.Now - active.EntryDt).ToString(); TicketNumber.Text = " Ticket - " + active.TicketNumber; CarNumber.Text = " Car - " + active.CarPlateNumber; } }