private void AccessControl_Add_Click(object sender, RoutedEventArgs e) { DialogBox d = new DialogBox(); d.ShowDialog(); Service.InsertUser_Type(d.result, username, password); for (int i = 0; i < TreeNodes.Length; i++) { TreeNodes[i].check = false; } for (int i = 0; i < TreeNodes.Length; i++) { for (int j = 0; j < TreeNodes[i].childs.Length; j++) { TreeNodes[i].childs[j].check = false; } } AccessControl_tree.Items.Refresh(); }