protected void DelGroup_Click(object sender, EventArgs e) { string Group_id = GROUP_IDLabel.Text;//TreeView1.SelectedNode.Value; OracleQuery2 cc2 = new OracleQuery2(); if (TreeView1.SelectedNode.Depth == 0) { return; } cc2.DeleteGroup(Group_id); TreeView1.Nodes.Clear(); bindTree(); string group_id = TreeView1.Nodes[0].Value; GROUPLabel.Text = TreeView1.SelectedNode.Text; GROUP_IDLabel.Text = TreeView1.SelectedNode.Value; Grid_group.DataSource = null; Grid_group.DataBind(); cl.DataSource = null; cl.DataBind(); BindGroupDetail(group_id, 0); }