Check if OrderedDictionary collection is read-only in CSharp

using System;/*  w  w  w. j av  a2s  . c o m*/
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("keyToDelete", "valueToDelete");
        myOrderedDictionary.Add("testKey3", "testValue3");
        
        Console.WriteLine( myOrderedDictionary.IsReadOnly);
   }
}