protected void Page_Load(object sender, EventArgs e) { group = new Groups(1); clsThuoctinh = new cls_thuoctinh(); if (!this.IsPostBack) { //Trees view treeview1.ShowCheckBoxes = TreeNodeTypes.All; treeview1.ShowLines = true; treeview1.ExpandDepth = 1; BildRoot(treeview1); // Setcontrol SetControl(false); } }