hashtable 绑定的datagrid

cs code

        protected System.Web.UI.WebControls.DataList datalist;
        Hashtable o = new Hashtable();
        private void Page_Load(object sender, System.EventArgs e)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("saf");
            DataRow dr = dt.NewRow();
            dr[0] = "todd ha ha";
            dt.Rows.Add(dr);
            dr = dt.NewRow();
            dr[0] = "summy ha ha";
            dt.Rows.Add(dr);
            o.Add(1,dt);
            o.Add(2,dt);
            o.Add(3,dt);
            this.datalist.DataSource = o;
            this.datalist.DataBind();
        }
        private void datalist_ItemDataBound(object sender, System.Web.UI.WebControls.DataListItemEventArgs e)
        {
            DataGrid obj = ((DataGrid)(e.Item.FindControl("datagridtest")));
            //object objItem = this.datalist.DataKeys[e.Item.ItemIndex];
            System.Collections.DictionaryEntry Entity = (System.Collections.DictionaryEntry)(e.Item.DataItem);
            DataTable bb = ((DataTable)(Entity.Value));
            obj.DataSource    = bb;
            obj.DataBind();        
        }

aspx code

    <asp:DataList ID="datalist" Runat="server"  DataKeyField ="key">
                <ItemTemplate>
                    <asp:Label ID ="labeltest" Runat=server text='<%# DataBinder.Eval(Container, "DataItem.key")%>' >
                    </asp:Label>
                    <asp:DataGrid ID="datagridtest" Runat=server  ></asp:DataGrid>
                </ItemTemplate>
            </asp:DataList>