There are 5 access modifiers. Access modifiers define scope for members.
Private: Accessible only with in the class.
Protected:-Accessible with in the class and in derived classes.
Friend (internal in C#):-Accessible anywhere within the current project.
Protected friend (protected internal in C#):-Accessible with current project and derived classes.
Public: -Accessible everywhere.
Also see the following video on Lambda expressions, Action, Func and Predicate in C#:-
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