ReadOnly Fields

   
 
using System;
using System.Collections.Generic;
using System.Text;

class Tire {
    public static readonly Tire GoodStone = new Tire(90);
    public static readonly Tire FireYear = new Tire(100);

    public int manufactureID;

    public Tire() { }
    public Tire(int ID) { manufactureID = ID; }
}

class Employee {
    public readonly string SSN;

    public Employee(string empSSN) {
        SSN = empSSN;
    }
}

class Program {
    static void Main(string[] args) {
        Tire myTire = Tire.FireYear;
        Console.WriteLine("ID of my tire is: {0}", myTire.manufactureID);

        Employee e = new Employee("111-22-1111");
        // e.SSN = "222-22-2222"; // error!
    }
}