Chapter 19a - Code DOES work!
To make the code in Chapter 19a work, I re-entered the "DataLayer.Recipe" line in the Page Load Event of the Category.aspx.cs file using Intellisense.
I re-added the Using.System.Data.Linq reference at the top of the page and made sure I referenced the correct .dll downloaded from the solution.
When I pressed F5 everything worked OK.
(This book is taking a lot longer than 24-hours - I've been at it for WEEKS! But I LOVE it!)