static void Main()
    {
        MyClass2 ob1 = new MyClass2(4, 5);
        MyClass2 ob2 = new MyClass2(6, 7);

        Console.Write("ob1: ");
        ob1.Show();
        Console.Write("ob2: ");
        ob2.Show();
        if (ob1.SameAs(ob2))
        {
            Console.WriteLine("ob1 and ob2 have the same values.");
        }
        else
        {
            Console.WriteLine("ob1 and ob2 have different values.");
        }
        Console.WriteLine();
        // Now, make ob1 a copy of ob2.
        ob1.Copy(ob2);
        Console.Write("ob1 after copy: ");
        ob1.Show();
        if (ob1.SameAs(ob2))
        {
            Console.WriteLine("ob1 and ob2 have the same values.");
        }
        else
        {
            Console.WriteLine("ob1 and ob2 have different values.");
        }
    }