Check if the Hashtable is read-only in CSharp

using System;/* w w  w  .java2  s  . c o m*/
using System.Collections;

class MainClass
{
    public static void Main()
    {
        Hashtable    hash = new Hashtable();
        hash.Add("A", "1");
        hash.Add("B", "2");
        hash.Add("C", "3");
        hash.Add("D", "4");
        hash.Add("E", "5");
        
        Console.WriteLine(hash.IsReadOnly);

    }
}