string treedname = dsentencename.Tables[0].Rows[j]["entencename"].ToString();
                        tnname[j] = new TreeNode(treedname);
                        tnname[j].Tag = dsentencename.Tables[0].Rows[j]["entenceurl"].ToString();
                        tnname[j].ImageIndex = 50;
                        tnname[j].SelectedImageIndex = 50;
                        tnmain[i + 1].Nodes.Add(tnname[j]);
                    }
                    treeView2.Nodes.Add(tnmain[i + 1]);
//将整块节点信息添加到树形中 轻量级企业运行管理综合系统设计+文献综述(17):http://www.youerw.com/jisuanji/lunwen_2845.html