private void btnMoveLeft_Click(object sender, EventArgs e) { if (lbxSelectedMechanics != null) { foreach (var item in lbxSelectedMechanics.SelectedItems) { MechanicList.Add(item as MechanicViewModel); } foreach (var item in MechanicList) { SelectedMechanicList.Remove(item as MechanicViewModel); } RebindListboxes(); } }