using System;

​

public class Program

{

    [STAThread]

    public static void Main(string[] args)

    {

        Employee e = new Employee();

        e.CalculatePay();

        SalariedEmployee s = new SalariedEmployee();

        s.CalculatePay();

        e = s;

        e.CalculatePay();

        Console.WriteLine(e.i);

    }

}

​

class Employee

{

    public void CalculatePay()

    {

        Console.WriteLine("Employee.CalculatePay()");

    }

}

​

class SalariedEmployee : Employee

{

    // these 2 lines are the same

    //      new public void CalculatePay()

    public void CalculatePay()

    {

        Console.WriteLine("SalariedEmployee.CalculatePay()");

    }

    public int i=100;

}