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 >