private void RoomSpecificationForm_Load(object sender, EventArgs e) { RoomsORM rOrm = new RoomsORM(); cmbRooms.DataSource = rOrm.Select(); cmbRooms.DisplayMember = "Name"; cmbRooms.ValueMember = "id"; SpecificationORM sOrm = new SpecificationORM(); listSpecification.DataSource = sOrm.Select(); listSpecification.DisplayMember = "Name"; listSpecification.ValueMember = "id"; }