datagrid或datalist中获取checkbox的id。

在datagrid或datalist 
的每一列中都插入checkbox， 
比如： 
            <asp:DataList ID="datalist1" runat="server" ShowHeader="True">
                <itemtemplate>
                    <table id="dg_table" width="100%" cellpadding="0" cellspacing="0" border="0">
                        <tr>
                            <td width="135" align="center" class="rule_text"><%#DataBinder.Eval(Container.DataItem,"id")%>
                            </td>
                            <td width="135" align="center" class="rule_text"><asp:CheckBox id="CheckBox1" runat="server"></asp:CheckBox>                                                                                    </td>
                            
                        </tr>                    </table>
                </itemtemplate>
            </asp:DataList>在页面中，用户选择的checkbox的多个复选项，请问如何获取相应的复选框的id？？？