Grouping Data into the ListView Control

Beore Designing HTML Page
Add New Item "Linq 2 Sql Classes" and Drag 2 table from Server Explorer
1) Customers
2) Orders

Design View of HTML Page
<asp:ListView ID="lvCustomerOrders" runat="server" ItemPlaceholderID="itemPlaceHolder">
<LayoutTemplate>
<h2>Customers</h2>
<ul>
<asp:PlaceHolder ID="itemPlaceHolder" runat="server">
</asp:PlaceHolder>
</ul>
</LayoutTemplate>
<ItemTemplate>
<li>
<b> <%# Eval("FirstName") %> <%# Eval("LastName") %> </b>
<asp:ListView ID="lvOrders" DataSource ='<%# Eval("Orders") %>' runat="server" ItemPlaceholderID="productPlaceHolder">
<LayoutTemplate>
<table>
<tr>
<th>
Order Name
</th>
<th>
Quantity
</th>
</tr>
<asp:PlaceHolder ID="productPlaceHolder" runat="server"></asp:PlaceHolder>
</table>
</LayoutTemplate>
<ItemTemplate>
<table width="120px">
<tr>
<td>
<%# Eval("OrderName") %>
</td>
<td>
<%# Eval("Quantity") %>
</td>
</tr>
</table>
</ItemTemplate>
<EmptyDataTemplate>
<li>
<table><tr><td style="color:Red">There are no Orders</td></tr></table>
</li>
</EmptyDataTemplate>
</asp:ListView>
</li>
</ItemTemplate>
</asp:ListView>
Code Behind of HTML Page
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
BindData();
}

}
private void BindData()
{
using (var db = new NwdDataClassesDataContext())
{
lvCustomerOrders.DataSource = from c in db.Customers
select c;
lvCustomerOrders.DataBind();
}

}