Listview - Datapager And Retrieving Value Of Label

I am trying to use the photo_id of a picture whilst a user uses a datapager to select different images. I am also getting the photo_id of the pictures through a label within the listview. However now i need that value so i pull out comments from another table according to this photo_id. I currently have th following code:-

PHP Code:
<asp:ListView ID="lvPhotoViewer" runat="server" GroupItemCount="1"
onselectedindexchanged="lvPhotoViewer_SelectedIndexChanged">
<LayoutTemplate>
<table ID="groupPlaceholderContainer" runat="server" border="1">
<tr ID="groupPlaceholder" runat="server">
</tr>
</table>
</LayoutTemplate>
<ItemTemplate>
<td id="Td4" align="center" style="background-color: #eeeeee;">
<asp:Image runat="server" ID="imPhoto" Height="450px" Width="450px" ImageUrl='<%#&nbsp;string.Format("~/photos/{0}",&nbsp;Eval("photo"))&nbsp;%>' />
<br />
<asp:Label ID="DefaultPhotIDLabel" runat="server" Text='<%#&nbsp;Eval("photo_name")&nbsp;%>' />
[B][U] <asp:Label ID="Label5" runat="server" Text='<%#&nbsp;Eval("photo_id")&nbsp;%>'/>[/U][/B]
</td>
</ItemTemplate>
<GroupTemplate>..............