Repeater控件ItemDataBound事件中出错，请大侠指教。在线等

页面：

1                            <asp:Repeater ID="CategoryDetails" runat="server" EnableViewState="false">
2                            <ItemTemplate>
3                                <li<asp:Literal ID="NowSubMenuClass" runat="server" Text=" class='' "></asp:Literal>>
4                                    <a href="<%# Eval("URL")%>"><%# Eval("MenuName")%></a> 
5                                </li>
6                            </ItemTemplate>
7                            </asp:Repeater> 

后台事件：

 1
 2
 3public partial class Control_SubMenu : System.Web.UI.UserControl
 4{
 5    Permaisuri.Sale.BLL.Menu bll = new Permaisuri.Sale.BLL.Menu();
 6    Permaisuri.Sale.Model.MenuInfo find = new MenuInfo();
 7    protected void Page_Load(object sender, EventArgs e)
 8    {
 9
10        string PID = Request.QueryString["PID"].ToString();
11        Int64 iPID = Int64.Parse(PID);
12
13        Permaisuri.Sale.Model.MenuInfo pModel = bll.Load(iPID);
14
15        CategoryTitle.Text = "<a href=\"" + pModel.URL + "\">" + pModel.MenuName + "</a>";
16
17        find.SetCSNull();
18        find.ParentID = iPID;
19
20        List<Permaisuri.Sale.Model.MenuInfo> Menu1 = new List<MenuInfo>();
21        
22        Menu1 = bll.ListEx(find, "OrderIndex");
23
24        CategoryDetails.DataSource = Menu1;
25        CategoryDetails.DataBind();
26
27   
28
29    }
30
31
32    protected void CategoryDetails_ItemDataBound(object sender, RepeaterItemEventArgs e)
33    {
34
35        if (e.Item.ItemType == ListItemType.Item)
36        {
37            Permaisuri.Sale.Model.MenuInfo ss = (Permaisuri.Sale.Model.MenuInfo)e.Item.DataItem;
38            Int64 SubMenuID = ss.MenuID;
39            Literal NowSubMenu = (Literal)e.Item.FindControl("NowSubMenuClass");
40            //判断是否为当前子菜单
41            if (IsNowSubMenu(SubMenuID))
42            {
43                NowSubMenu.Text = " class='nowsubmenu' ";
44
45            }     
46        
47        }
48
49    }
50
51    private bool IsNowSubMenu(Int64 NowCID)
52    {
53        string CID = Request.QueryString["CID"];
54        if (!(CID == "" || CID == null))
55        {
56            if (Int64.Parse(CID) == NowCID)
57            {
58                return true;
59            }
60        }
61        return false;
62    }
63
64
65}

出错：ItemDataBound事件中
    根据获取的Request.QueryString["CID"]值是否为当前绑定的MenuID，进行比较。相等则设置ID为NowSubMenuClass的Literal的Text值为当前菜单的class名称.

但运行时,没有效果。

是哪里的问题呢？在线等