The designer cannot create an instance of type declared as abstract.

[Ky Nam]

Hi I created these classes :

MustInherit Class DataTableManager
Inherits UserControl
End Class

Class OrderManager
Inherits DataTableManager
End Class

When I open OrderManager in designer , I get : Warning - The designer must create an instance of type 'DataTableManager' but it cannot because the type is declared as abstract. Is there any way to open OrderManager in designer ?

[Dave Kreskowiak]

Nope. If there is an abstract class in the inheritance chain, it won't work. The designer cal only work with concrete classes.

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Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic
     2006, 2007

[nlarson11]

sometimes the issue is the datatablemanager wasn't compiled. we have class that we call "formbase". all of our forms inherit from it. sometimes when that class is changed or something related to it changes, I have to compile the project that class is in then my form that inherits from it will show. a control would follow under the same behavior...