C# - Passing LINQ DataRow Reference In GridView's ItemTemplate

SOLVED. Code has been edited to reflect solution. Given the following GridView:

<asp:GridView runat="server" ID="GridView1" AutoGenerateColumns="false" DataKeyNames="UniqueID"
OnSelectedIndexChanging="GridView1_SelectedIndexChanging" >
<Columns>
<asp:BoundField HeaderText="Remarks" DataField="Remarks" />
<asp:TemplateField HeaderText="Listing">
<ItemTemplate>
<%# ShowListingTitle( Container.DataItem ) %>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="Amount" DataField="Amount" DataFormatString="{0:C}" />
</Columns>
</asp:GridView>

which refers to the following code-behind method:

protected String ShowListingTitle( object /* was DataRow */ row )
{
Listing listing = ( Listing ) row;
return NicelyFormattedString( listing.field1, listing.field2, ... );
}

The cast from DataRow to Listing was failing (cannot convert from DataRow to Listing) I'm certain the problem lies in what I'm passing from within the ItemTemplate, which is simply not the right reference to the current record from the LINQ to SQL data set that I've created, which looks like this:

private void PopulateGrid()
{
using ( MyDataContext context = new MyDataContext() )
{
IQueryable < Listing > listings = from l in context.Listings where l.AccountID == myAccountID select l;
GridView1.DataSource = listings;
GridView1.DataBind();
}
}