When I create a new VS2010 project (either a windows forms application or a class library), the project will add a reference to System.Core.dll. If I delete that reference from that project, the project still compiles fine even though there is 'Using System.Linq;' in my code. If I try to re-add the System.Core reference to my project it will throw an exception with this message: "A reference to 'System.Core' could not be added. This component is automatically referenced by the project system and cannot be referenced directly".
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