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I have a project that was being compiled in .net 3.5, when I converted it to .net 4.0 I receive a compile error saying:
“The base class or interface of ‘MyApplication.ClassName’ could not be resolved or in invalid.”
This class implements ObservableCollection but other than that there is nothing special about it. Has anyone else ran into this issue?
ObservableCollectionclass was defined inWindowsBase.dllin v3.0 and was moved toSystem.dllin v4.0. Maybe you should check your project’s references.