repeater内按纽值的获取

<asp:Repeater ID="rptRightItemList" runat="server">
                                            <ItemTemplate>
                                                <div>
                                                    <%#Eval("displayname")%></div>
                                                <asp:Panel ID="plSubStoreLimite" runat="server" onmousemove="showBorder(this)" onmouseout="notShowBorder(this)">
                                                    <table cellpadding="0" cellspacing="0">
                                                        <tr>
                                                            <td style="padding-left: 5px">
                                                                <asp:Label ID="labSubStoreLimite" runat="server" Text='<%# Eval("displayname") %>'
                                                                    ForeColor="#0066FF"></asp:Label>
                                                            </td>
                                                            <td style="padding-left: 5px">
                                                                <asp:ImageButton ID="imgbtnDelRight" runat="server" ImageUrl="../images/delButtom.gif"
                                                                    CssClass="delButtomImg" OnClientClick="return confirm('确认删除？')" OnClick="imgbtnDelRight_OnClick" CommandArgument='<%#Eval("id") %>' />
                                                                
                                                            </td>
                                                        </tr>
                                                    </table>
                                                </asp:Panel>
                                            </ItemTemplate>
                                        </asp:Repeater> 后台代码        protected void imgbtnDelRight_OnClick(object sender, EventArgs e)
        {
            ImageButton imgbtnDelRight = (ImageButton)sender;

            Tdep_Right daRight = new Tdep_Right();
            if (!daRight.Delete(int.Parse(imgbtnDelRight.CommandArgument)))
            {
                Alert("删除失败");
                return;
            }
            Alert("删除成功");
        }