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I was having troubles earlier while trying to declare a ChangeAction parameter in a method, with the IDE saying I might be missing a Namespace.
So I right click it and Resolve it and find that System.Data.Linq has been added and now everything is fine.
What is the difference between these two namespaces?
As I understand it, System.Linq is about the overall Linq library — it applies to all data types like Lists and such.
System.Data.Linq is about databases (aka Linq to SQL), which includes tracking changes (ChangeAction).