The type or namespace name 'ObservableCollection' could not be found

user_277581 0
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I am working with Entity Framework in asp.net c# framework 3.5 I have generated entity classes using poco generator template. But I am getting following error:

The type or namespace name ObservableCollection could not be found (are you missing a using directive or an assembly reference?)

FYI System.Collections.ObjectModel is also added in class.

What could be wrong? How to resolve it?

entity-framework asp.net c#
5 Answers

Add WindowsBase to your reference.

user_13174080
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