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Editorial Team
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Asked: 2026-06-11T20:23:21+00:00

System.Collections.ObjectModel is included. Visual studio 2012 still says Type or namespace name ‘ObservableCollection’ could

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System.Collections.ObjectModel is included. Visual studio 2012 still says Type or namespace name 'ObservableCollection' could not be found.

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Code:

class ObservableClass : ObservableCollection<OtherClass>
{
}

EDIT: This is .NET Framework 3.5 and is a console application

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1 Answer

  1. Editorial Team

    You’re probably missing an assembly reference… depending on which framework you are targeting, this class might be found:

    • in WindowsBase.dll (.NET 3.x)
    • in System.dll (.NET 4.x)
    • in System.Windows.dll (Silverlight/Windows Phone 7)
    • in System.ObjectModel.dll (WinRT) (included in “.NET for Windows Store apps”)
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