treeview控件的使用

        #region-----绑定数据

        private void treeDataBind()
        {
            TreeView1.Nodes.Clear();//在重新加载之前将原来的节点清除 

            TreeNode tn = new TreeNode();
            tn.Text = "企业类型";
            tn.Value = "1";
            tn.SelectAction = TreeNodeSelectAction.None;
            tn.Text += "<a href='AJJ_QYtypeAdd.aspx?pID=" + 0 + "' style='cursor:pointer' onMouseOver= \"window.status= 'none';return true\"  onmousedown= \"window.status= 'none';return true\"><img src ='../images/pic/t.jpg' style='border:0' /></a>"; tn.Expanded = true;


            TreeView1.Nodes.Add(tn);
            DataTable dts = typeFunc.getQYlbData();
            for (int i = 0; i < dts.Rows.Count; i++)//循环绑定企业大类
            {
                TreeNode tn1 = new TreeNode();
                tn1.Text = dts.Rows[i]["name"].ToString();
                tn1.Value = dts.Rows[i]["id"].ToString();
                tn1.SelectAction = TreeNodeSelectAction.None;
                tn1.Text += "<a href='AJJ_QYtypemanage.aspx?id=" + dts.Rows[i]["id"] + "' style='cursor:pointer' onMouseOver= \"window.status= 'none';return true\"  onmousedown= \"window.status= 'none';return true\"><img src ='../images/pic/b.jpg' style='border:0' /></a>";
                tn1.Text += "<a href='AJJ_QYtypeAdd.aspx?pID=" + dts.Rows[i]["id"] + "' style='cursor:pointer' onMouseOver= \"window.status= 'none';return true\"><img src ='../images/pic/t.jpg' style='border:0' /></a>"; tn1.Expanded = false;
                tn1.Text += "<a onClick=\"deleteType('您确定要删除该企业类型；并将其类型下的子类型全部删除吗？," + Convert.ToInt32(dts.Rows[i]["id"]) + "')\"  style='cursor:pointer' ><img src ='../images/pic/s.jpg' style='border:0 ' /></a>"; tn1.Expanded = false;
                TreeView1.Nodes[0].ChildNodes.Add(tn1);

                DataTable dtbs = typeFunc.getQYLittlelbData(Convert.ToInt32(dts.Rows[i]["id"].ToString()));//根据大类编号循环绑定小类
                for (int j = 0; j < dtbs.Rows.Count; j++)
                {
                    TreeNode tn2 = new TreeNode();