ReadOnly ReAssign

readonly.cs

using System;

class Program
{
    class _class
    {
        public readonly int readOnly = 1;
        public _class() { }
        public _class(int newValue)
        {
            readOnly = newValue;
        }
    }

    static void Main(string[] args)
    {
        _class c1 = new _class();

        _class c2 = new _class(5);

        Console.WriteLine("Orginal: " + c1.readOnly);
        Console.WriteLine("New Value: " + c2.readOnly);

        Console.ReadKey();
    }
}