.net Repeater嵌套的数据绑定问题

<asp:Repeater ID="Repeater3" runat="server" OnItemDataBound="Repeater3_ItemDataBound">
        <ItemTemplate>

              bind(Data)//绑定的数据

        <asp:Repeater ID="Repeater4" runat="server">
             <ItemTemplate>

             bind(Data)//绑定的数据

             </ItemTemplate>
       </asp:Repeater>

       </ItemTemplate>
 </asp:Repeater>

后台Repeater4的绑定

        /// <summary>
        ///数据绑定
        ///绑定回复
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Repeater3_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            {
                Repeater rpt1 = e.Item.FindControl("Repeater4") as Repeater;
                if (rpt1 != null)
                {
                    Repeater rep = (Repeater)e.Item.FindControl("Repeater4");
                    DataRowView rowv = (DataRowView)e.Item.DataItem;//找到分类Repeater关联的数据项
                    int typeid = Convert.ToInt32(rowv["id"]); //获取填充子类的id
                    StringBuilder sb = new StringBuilder("select 语句 ");
                    sb.Append(" where 条件(用到typeid )“);
                    DataSet ds = Maticsoft.DBUtility.DbHelperSQL.Query(sb.ToString());
                    rep.DataSource = ds;
                    rep.DataBind();
                }
            }

        }