Get a read-only copy of the OrderedDictionary in CSharp

using System;/*  w  ww .  j  a va 2s . c  om*/
using System.Collections;
using System.Collections.Specialized;

public class SamplesStringCollection  {

   public static void Main()  {
        OrderedDictionary myOrderedDictionary = new OrderedDictionary();
        myOrderedDictionary.Add("testKey1", "testValue1");
        myOrderedDictionary.Add("testKey2", "testValue2");
        myOrderedDictionary.Add("testKey3", "testValue3");

        OrderedDictionary my = myOrderedDictionary.AsReadOnly();
        
        Console.WriteLine(my.IsReadOnly);
   }

}