asp.net（C#）中Repeater嵌套绑定Repeater

Repeater嵌套Repeater的结构：一般写过的都能看懂吧

    private void RpTypeBind()
    {
        //GetQuestionTypeAndCount() 返回一个datatable
        this.rptypelist.DataSource = LiftQuestionCtr.GetQuestionTypeAndCount();
        this.rptypelist.DataBind();
    }
    protected void rptypelist_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
 
        //判断里层repeater处于外层repeater的哪个位置（ AlternatingItemTemplate，FooterTemplate，
        //HeaderTemplate，，ItemTemplate，SeparatorTemplate）
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {
            Repeater rep = e.Item.FindControl("rpquestionlist") as Repeater;//找到里层的repeater对象
            DataRowView rowv = (DataRowView)e.Item.DataItem;//找到分类Repeater关联的数据项 
            int typeid = Convert.ToInt32(rowv["qtid"]); //获取填充子类的id 
            rep.DataSource = LiftQuestionCtr.GetSomeQuestionsByTypeid(typeid, 2);
            rep.DataBind();
        }
    }

<table border="0" cellpadding="0" cellspacing="0" style="margin-bottom: 5px" width="100%">
    <asp:Repeater runat="server" ID="rptypelist" OnItemDataBound="rptypelist_ItemDataBound">
        <ItemTemplate>
            <tr>
                <td class="fb">
                      <a href="Lists.aspx?Qtid=<%#Eval("qtid") %>"><%#Eval("qtypename") %></a> <span id="askCount_15"
                        class="date2">[<%#Eval("typecount")%>]</span>
                </td>
            </tr>
            <tr>
                <td>
                    <div id="askTop2_15" class="ask_list">
                        <asp:Repeater runat="server" ID="rpquestionlist">
                            <ItemTemplate>
                                <a href="Question.aspx?qid=<%#Eval("liftquestionid")%>">
                                    <%#Eval("questiontitle")%></a><br />
                            </ItemTemplate>
                        </asp:Repeater>
                    </div>
                </td>
            </tr>
        </ItemTemplate>
    </asp:Repeater>
</table>