TreeView递归绑定地区列表

private Service svc = Service.GetInstance();    
DataSet allRegion;
protected void Page_Load(object sender, EventArgs e)
    {
        if(!IsPostBack){
            InitPage();
        }
    }

    private void InitPage() { 
        string lang  = "sc";
        allRegion = svc.GetAllRegion(lang);
        AddNode(0, null);
        
    }

    private void AddNode(int fid, TreeNode fatherNode) {
        DataRow[] rows = allRegion.Tables[0].Select("fid=" + fid);
        foreach(DataRow row in rows){
            TreeNode node = new TreeNode(row["name"].ToString(), row["id"].ToString());
            node.Expanded = false;
            if (fatherNode == null)
            {
                trvRegion.Nodes.Add(node);
            }
            else {
                fatherNode.ChildNodes.Add(node);
            }
            AddNode(int.Parse(row["id"].ToString()), node);
        }
    }