I’ve refferenced my project to the MEF’s dlls
System.ComponentModel.Composition.dll
System.ComponentModel.Composition.Initialization.dll
from C:\Program Files\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client
But the compiler doesn’t recognize the PartInitializer.
Why ?!

PartInitializeris changed toCompositionInitializer: