I understood it to mean the form's code file (CustomerOrdersForm.cs)

>Just a quick question as I am working through K. McNeish's book.
>
>Near the top of page 267 it says "..add a reference to the following namespaces to the top of the code file."
>
>

>using System.Data;
>using HW.NetBook.Samples.Business
>

>
>Did the book mean in the OrdersBusiness.cs file? That file already has
>

>using System.Data ;
>namespace HW.NetBook.Samples.Business
>

>at the top of the code (see page 266).
>
>Simple question, but it is better to clear on these things than to stumble along.
>
>Thanks,
>
>Kevin