repeater下绑定了hyperlink，最后一项绑定不了链接，求解释
前台代码
<asp:Repeater ID="repArea" runat="server" onitemdatabound="repArea_ItemDataBound">
                <ItemTemplate>   
<li>
                <asp:HiddenField ID="hid_area" runat="server" Value='<%# Eval("areaID") %>' />
                <asp:HyperLink ID="linkarea" runat="server"><%# Eval("areaName") %></asp:HyperLink>
                </li>


后台代码：
private void BindRepArea()
        {
            BLL.area bll = new BLL.area();
            repArea.DataSource = bll.GetList("");
            repArea.DataBind();
            
        }
for (int i = 0; i < repArea.Items.Count; i++)
                {
                    HyperLink link = repArea.Items[i].FindControl("linkarea") as HyperLink;
                    HiddenField hid = repArea.Items[i].FindControl("hid_area") as HiddenField;
                    link.NavigateUrl = "market.aspx?class=" + str + "&area=" + hid.Value;
                }
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