绑定无限级的树形菜单TreeView

绑定无限级的树形菜单，在前台需要的地方拖放一个TreeView控件，后台绑定代码如下：

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class InfinitTree : System.Web.UI.Page
{
    string sql = null;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindTVInfinite();
        }
    }
    void BindTVInfinite()
    {
        sql = "select * from treeTable where parentID=0";
        DataTable dt = DataBase.ExecuteDataSet(sql).Tables[0];
        foreach (DataRow dr in dt.Rows)
        {
            TreeNode node = new TreeNode();
            node.Text = dr["treeName"].ToString();
            node.Value = dr["treeID"].ToString();
            //bind child nodes
            BindNodes(int.Parse(dr["treeID"].ToString()), node);
            TVInfinite.Nodes.Add(node);
        }
    }
    void BindNodes(int parentID,TreeNode node)
    {
        sql = string.Format("select * from treeTable where parentID={0}",parentID);
        DataTable dt = DataBase.ExecuteDataSet(sql).Tables[0];
        foreach (DataRow rows in dt.Rows)
        {
            TreeNode tnode = new TreeNode();
            tnode.Text = rows["treeName"].ToString();
            tnode.Value = rows["treeID"].ToString();
            node.ChildNodes.Add(tnode);
            BindNodes(int.Parse(rows["treeID"].ToString()), tnode);
        }
    }
}