When you want to find all the objects that are missing a corresponding object, then you need the LINQ equivalent of an outer join. Here, step by painful step, is how to build that query. Here's a ...
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Language Integrated Query (LINQ) for .NET and its System.Query, System.Data.DLink, and System.Xml.XLink classes enable relational-to-object and XML-to-object mapping with first-class CLR data types.