in C#, you need use internal to simulate that, http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/vbconPrivateCommunicationBetweenComponentsInAssemblies.aspor see the new feature "Friend Assemblies" in 2.0http://msdn2.microsoft.com/en-us/library/0tke9fxk.aspx
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