datalist中使用按钮无法跳转

前台代码：
<asp:DataList ID="DLrefinement" DataKeyField ="BookID" runat="server"  RepeatColumns="3" RepeatDirection="Horizontal"    OnItemCommand="DLrefinement_ItemCommand" CellPadding="4" ForeColor="#333333" 
                    Width="540px">
                    <ItemTemplate>
                        <table align="left" cellpadding=0 cellspacing=0 style =" width :135px; height:158px;" >
                            <tr align =center style =" width :135px; height:65px;" >
                                <td colspan="2" align="center" >
                                    <asp:Image ID="imageRefine" Width=70px Height=100px runat="server"  ImageUrl =<%#DataBinder.Eval(Container.DataItem,"BookUrl")%>/></td>
                            </tr>
                            <tr align =center valign =bottom style =" width :135px; height:11px; font-size: 9pt; font-family: 宋体;">
                                <td colspan="2" align="center">
                                    <%#DataBinder.Eval(Container.DataItem, "BookName")%>
                                </td>
                            </tr>
                            <tr align =center valign =bottom style =" width :135px; height:11px; font-size: 9pt; font-family: 宋体;">
                                <td align="center" >
                                    市场价格</td>
                                <td align="left" >
                                    ￥ <%#GetMkprice(DataBinder.Eval(Container.DataItem, "Marketprice", "{0:f2}").ToString())%>
                                    </td>
                            </tr>
                            <tr align =center valign =bottom style =" width :135px; height:11px;font-size: 9pt; font-family: 宋体;">
                                <td align="center" >
                                    会员价格</td>
                                <td align="left" >
                                    ￥ <%#GetMeberprice(DataBinder.Eval(Container.DataItem, "MemberPrice", "{0:f2}").ToString())%>
                                    </td>
                            </tr>
                            <tr align =left valign =bottom  style =" width :135px; height:11px;font-size: 9pt; font-family: 宋体;">
                                <td colspan="2" align="center" >
                                    <asp:ImageButton ID="btndetafil" runat="server"  ImageUrl="~/Image/btn_detail.gif" CommandName="detailsee" />
                                    <asp:ImageButton ID="btnbuy" runat="server" ImageUrl="~/Image/btn_buy.gif" CommandName="buybook" CommandArgument ='<%# DataBinder.Eval(Container.DataItem, "BookID") %>'/>
                                </td>
                            </tr>
                        </table>
                    </ItemTemplate>
                    <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                    <SelectedItemStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
                    <AlternatingItemStyle BackColor="White" />
                    <ItemStyle BackColor="#EFF3FB" />
                    <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                </asp:DataList>
后台代码：
protected void DLrefinement_ItemCommand(object source, DataListCommandEventArgs e)
    {
        if (e.CommandName == "detailsee")
        {
            Session["address"] = "";
            Session["address"] = "index.aspx";
            Response.Redirect("~/User/showgoodsInfo.aspx?BookID=" + Convert.ToInt32(DLrefinement.DataKeys[e.Item.ItemIndex].ToString()));
        }
        else if(e.CommandName=="buybook")
        {
            AddShopCart(e);
        }
    }
高手帮忙解决下，如果解决了，可以加分