asp.net二级嵌套repeater

<asp:Repeater id="dlFileType"  runat="server" onitemdatabound="dlFileType_ItemDataBound1">
<ItemTemplate>
 <asp:Label ID="lblzyc" runat="server" Text='<%#Eval("id") %>' Visible="false"></asp:Label>
  <li class="level1"><a  href="#"><%#Eval("name") %></a>
    
         <ul class="level2">
            
<asp:Repeater id="dlFileList" runat="server" >
<ItemTemplate>

            <li><a href='product.aspx?id=<%#Eval("id") %>'><%#Eval("name") %> </a></li>
          
        
      
</ItemTemplate>
</asp:Repeater>
 </ul>
      </li>
</ItemTemplate>
</asp:Repeater>

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataBind();
        }
    }
    private void DataBind()
    {
        string sql = "select * from tclass where rootid=0";
        DataTable dt = lisichuang.myDataAdapter(sql);
        dlFileType.DataSource = dt;
        dlFileType.DataBind();
    }

    protected void dlFileType_ItemDataBound1(object sender, RepeaterItemEventArgs e)
    {
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {
            Repeater dataList = (Repeater)e.Item.FindControl("dlFileList");
            Label lbl = (Label)e.Item.FindControl("lblzyc");

            int mainID = Convert.ToInt32(lbl.Text);
            //this.Page.ClientScript.RegisterStartupScript(GetType(), "", "<script>alert('" + mainID.ToString() + "！')</script>");
            if (mainID > 0)
            {
                //string sql = "select * from  article";
                string sql = "select  * from tclass where rootid=" + mainID + "  order by id asc";
                DataTable dt = lisichuang.myDataAdapter(sql);
                dataList.DataSource = dt;
                dataList.DataBind();
            }
        }
    }