Grouping Data with the ListView Control

<asp:ListView ID="ProductList1" runat="server"
DataSourceID="ProductDataSource"
GroupItemCount="3" ItemPlaceholderID="itemsGoHere"
GroupPlaceholderID="groupsGoHere">

<LayoutTemplate>
<p>
<asp:PlaceHolder runat="server" ID="groupsGoHere"></asp:PlaceHolder>
</p>
</LayoutTemplate>

<GroupTemplate>
<ol>
<asp:PlaceHolder runat="server" ID="itemsGoHere"></asp:PlaceHolder>
</ol>
</GroupTemplate>

<ItemTemplate>
<li><%#Eval("ProductName")%></li>
</ItemTemplate>
</asp:ListView>