using System;

​

public class Customer {

    private int CustomerID { get; set; }

    public string ComputerName { get; set; }

    protected string State { get; set; }

}

​

public class MyCustomer : Customer {

    public int CustomerID { get; set; }

    public new string State { get; set; }

​

    public void Output() {

        Console.WriteLine(this.State);

        Console.WriteLine(this.ComputerName);

        Console.WriteLine(this.CustomerID);

    }

}

​

public class Program

{

    public static void Main()

    {

        MyCustomer customer = new MyCustomer();

        customer.ComputerName = "ComputerName";

        customer.CustomerID = 12345;

        customer.State = "State";

        customer.Output();

    }

}