Assemblies as Friends in C#

In this session, I'm going to show you how classes or assemblies can be friends in C#. This means that some private members, methods or classes in some assembly will only be exposed to friend assembly but not others.
This feature is extremely important for test-driven systems and shared assemblies or libraries or nuget packages with external consumers.
Here's a reference to this feature here:
learn.microsof...
Here's a link to LeVent project:
github.com/has...