You can set proprty RepeatDirection="Horizontal" to Repeater....:)
<asp:Repeater ID="Repeater1" runat="server">
<ItemTemplate>
<asp:DataList ID="dlData" runat="server" RepeatDirection="Horizontal"
RepeatColumns="5">
<ItemTemplate>
<table>
<tr>
<td><%#Container.DataItem %></td>
</tr>
<tr>
<td>--------------</td>
</tr>
</table>
</ItemTemplate>
</asp:DataList>
</ItemTemplate>
</asp:Repeater>
Regards,
Nirav Prabtani.