Question

I just want to know what is the actual difference between private and protected internal access specifier. As i know

Visible to own class members: private and protected internal YES

Visible to object of other classes: Both NO

Visible to objects of other classes outside the namespace collection: Both NO

Visible to object of child classes outside the namespace collection: Both NO

If private doing the same as protected internal then why we need the both just one should be enough or not?

Answer 1

• A protected internal member is visible to any code in the current assembly or in a derived class in another assembly. In technical words, it’s the logical disjunction of protected and internal.
• A private member is visible only to code in the same class.

protected internal is actually the second most permissive access modifier after public.

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It’s worth noting that protected is arguably more permissive than internal, since it allows access from code that you have no control over (i.e. other assemblies). While internal allows access from all code in the current assembly, this code is yours and you have control over it!

To paraphrase, protected (and protected internal) members are part of the public API of your assembly (and should therefore be documented). internal members are not.