interface - C# - Being unable to implement "INotifyDataErrorInfo" -


i have c# class.

  class myclass: anotherclass, inotifydataerrorinfo   {            ..................                }

i need implement "inotifydataerrorinfo" interface too. comes in red colour , not identify namespace of interface. have added "using system.componentmodel;" too. not work.

anyone knows why ?

enter image description here

inotifydataerrorinfo in namespace system.componentmodel in assembly system. make sure have using system.componentmodel; in source code , project (.csproj) references system.dll.


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