using System;

​

public class A

{

    public int _i;

    public A(int i)

    { 

        this._i = i * 2;

        Console.WriteLine("In class A, _i = {0}", this._i);

    }

}

​

public class B : A

{

    private int _x;

    public B(int x) : base(x)

    {

        _x = x + 1;

        Console.WriteLine("In class B, _x = {0}", this._x);

        Console.WriteLine("In class B, the public base _i = {0}", this._i);

    }

}

​

public class Program

{

    public static void Main()

    {

        B b = new B(5);

    }

}