protected internal

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The protected internal keyword marks field, methods, properties and nested classes for use inside the same assembly or derived classes in another assembly:

Assembly 1

public class Foo
{
    public string MyPublicProperty { get; set; }
    protected internal string MyProtectedInternalProperty  { get; set; }

    protected internal class MyProtectedInternalNestedClass
    {
        private string blah;
        public int N { get; set; }
    }
}

public class Bar
{
    void MyMethod1()
    {
        Foo foo = new Foo();
        var myPublicProperty = foo.MyPublicProperty;
        var myProtectedInternalProperty = foo.MyProtectedInternalProperty;
        var myProtectedInternalNestedInstance =
            new Foo.MyProtectedInternalNestedClass();
    }
}

Assembly 2

public class Baz : Foo
{
    void MyMethod1()
    {
        var myPublicProperty = MyPublicProperty;
        var myProtectedInternalProperty = MyProtectedInternalProperty;
        var thing = new MyProtectedInternalNestedClass();
    }

    void MyMethod2()
    {
        Foo foo = new Foo();
        var myPublicProperty = foo.MyPublicProperty;

        // Compile Error
        var myProtectedInternalProperty = foo.MyProtectedInternalProperty;
        // Compile Error
        var myProtectedInternalNestedInstance =
            new Foo.MyProtectedInternalNestedClass();
    }

}

public class Qux
{
    void MyMethod1()
    {
        Baz baz = new Baz();
        var myPublicProperty = baz.MyPublicProperty;

        // Compile Error
        var myProtectedInternalProperty = baz.MyProtectedInternalProperty;
        // Compile Error
        var myProtectedInternalNestedInstance =
            new Baz.MyProtectedInternalNestedClass();
    }

    void MyMethod2()
    {
        Foo foo = new Foo();
        var myPublicProperty = foo.MyPublicProperty;

        //Compile Error
        var myProtectedInternalProperty = foo.MyProtectedInternalProperty;
        // Compile Error
        var myProtectedInternalNestedInstance =
            new Foo.MyProtectedInternalNestedClass();
    }
}

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