Friend

[Nicholas Paldino [.NET/C# MVP]]

The closest thing that you have in C# is the internal keyword, which
means that any other type in the same assembly can access the member/type.

Hope this helps.

 

[msnews.microsoft.com]

How can I use friend functions in C# like C++?

 

[q]

There are no 'friend' functions in C#.

internal:
Access is limited to the current project.

protected internal:
Access is limited to the current project or types derived from the
containing class.