If you just want to show the images in a single row, you can just put them in the columns of a single row. Try rewriting the listview markup as follows (move table
,tr
markups into LayoutTemplate
):
<asp:ListView runat="server" ID="PageHorizon">
<LayoutTemplate>
<table>
<tr>
<asp:PlaceHolder ID="itemPlaceholder" runat="server"></asp:PlaceHolder>
</tr>
</table>
</LayoutTemplate>
<ItemTemplate>
<td>
<img src='<%#Eval("ImagePath")%>' alt="Single Image"
width="64px" height="64px" />
</td>
</ItemTemplate>
</asp:ListView>