Article body - Lazy Loading
The book makes mention in multiple locations that the article body uses a lazy loading pattern. Specifically on page 180 showing the xml of the dbml file the IsDelayedLoaded = true and the paragraph at the bottom of the page calls attention to this. Code is shown on pages 182-186 from the .designer.cs is shown with a code comment on page 182 for the body column once again noting the lazy load; and at the end of the multi-page code listing the first paragraph once again calls attention to the lazy load of the body.
So, why is it that the downloadable source code does not have the lazy load implemented in the dbml if such a big deal was made over it in the book?