http://blogs.msdn.com/mattwar/archive/2007/06/21/linq-to-sql-objects-all-the-way-down.aspx : "EntityRef and EntitySet don’t actually tie back to the database or LINQ to SQL infrastructure at all. They were designed to be completely free of any such entanglements, having no references back to contexts, connections or other abstractions. Deferred loading is based on assigning each a simple IEnumerable source, such as a LINQ query. http://odetocode.com/Blogs/scott/archive/2008/05/11/12074.aspx : "EntitySet
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