Accessibility about Nested class & Inherited class

C++

#include "stdafx.h"

class People2
{
protected: static int staticMember2;
protected:           int nonstaticMember2;
public:        People2() {} // Must have the line, it implicitly initializes nonstaticMember2
};

class Man2 : public People2
{
public: void setName(People2 x2)
        {
            printf("%d\n", x2.staticMember2 = 3);  // it's ok
            printf("%d\n", x2.nonstaticMember2 = 6);  // error: inaccessible due to protected
        }
};

/*******  Above explains inheritance of class, below explains nested class  **********/

class People
{
private:
    int nonstaticMember;
    static int staticMember;

    static void test() 
    {
        printf("People Method\n");
    }

public:
    People() {} // Must have the line, it implicitly initializes nonstaticMember

    class Man
    {
    public:
        void setName(People x)
        {
            printf("%d\n", x.nonstaticMember = 4); // a little weird...
            printf("%d\n", People::staticMember = 8); 
            printf("%d\n", staticMember); // Be the same as People::staticMember
            test();
        }
    };
};

/* The declaration of all static class members must be defined outside all blocks */
int People::staticMember;    
int People2::staticMember2;

/* main entry */
void _tmain(int argc, _TCHAR* argv[])
{
    /* Nested classes example */
    People chinese;
    People::Man tom;

    tom.setName(chinese);

    /* Inheritance example */
    People2 japanese;
    Man2 eric;

    eric.setName(japanese);
}

C#

using System;

class People2
{
    protected static int staticMember2;
    protected int nonstaticMember2;
}

class Man2 : People2
{
    public void setName(People2 x2)
    {
        Console.WriteLine("{0}", People2.staticMember2 = 3);  // it's ok
        Console.WriteLine("{0}", x2.nonstaticMember2 = 6);  // error: inaccessible due to private
    }
}

/*******  Above explains inheritance of class, below explains nested class  *****************/

class People
{
    private int nonstaticMember;
    private static int staticMember;
    private static void test()
    {
        Console.WriteLine("People Method");
    }
    class Man
    {
        public void setName(People x)
        {
            Console.WriteLine("{0}", x.nonstaticMember = 4);  // a little weird...
            Console.WriteLine("{0}", People.staticMember = 8 );
            Console.WriteLine("{0}", staticMember);  // Be the same as People.staticMember
            test(); // accessible to the contained static class method
        }
    }

    static void Main()
    {
        /* Nested classes example */
        People chinese = new People();
        People.Man tom = new People.Man();

        tom.setName(chinese);

        /* Inheritance example */
        People2 japanese = new People2();
        Man2 eric = new Man2();

        eric.setName(japanese);
    }
}