What is the default access modifier of a class?

Question

What is the default access modifier of a class?

Answer 1

internal, if defined directly in the namespace (probably most classes):

Internal is the default if no access modifier is specified

For classes within other classes, the default is private, like class members:

The access level for class members and struct members, including nested classes and structs, is private by default.

Source: http://msdn.microsoft.com/en-us/library/ms173121.aspx