Default Class Accessibility in C#

Default Class Accessibility in C#

There are two rules for Default Class Accessibility in C# as in the following:

1. Top-level classes, which are not nested in other classes, can only have internal or public accessibility. The default accessibility for these classes is internal.

2. Nested classes, which are members of other classes, can have declared accessibility as indicated in the following table.

Members of	Default member accessibility	Allowed declared accessibility of the member
enum	public	None
class	private	public  protected  internal  private  protected internal
interface	public	None
struct	private	public  internal  private

Ref: Accessibility Levels (C# Reference), msdn.microsoft.com, Nov. 06, 2016.