控件查找问题

 <table>
             <asp:Repeater ID="rpt_inves" runat="server" OnItemDataBound="rpt_inves_ItemDataBound">
             <ItemTemplate>
                <tr>
                    <td><b><h7><%#Eval("VoteContent") %></h7></b></td>
                </tr>
                <tr>
                    <td>
                        <table>
                            <asp:Repeater ID="rpt_items" runat="server">
                                <ItemTemplate>
                                    <tr>
                                    <td>
                                      <input id="Radio_Item" name="samename" type="radio" />
                                      <%#Eval("ItemText") %>
                                     </td>
                                     <td>
                                         <input id="Hidden1" type="Hidden" name="hidvalue" runat="server" value='<%#Eval("ItemID") %>'/>
                                     </td>
                                    </tr>
                                </ItemTemplate>
                            </asp:Repeater>
                        </table>
                    </td>
                </tr>
                <tr><td>
                    <asp:Button ID="bt_save" runat="server" Text="提  交" OnClick="bt_save_Click"/>
                </td></tr>
             </ItemTemplate>
             </asp:Repeater>
         </table>

 一个repeate里面有个repeate，在后面那个repeate里面有个radio框，在bt_save点击事里取值取不到，不知道选中了哪个