Check if the ArrayList is read-only in CSharp

using System; /*from  w  w  w.  ja v  a  2 s .  co  m*/
using System.Collections; 
 
class MainClass { 
  public static void Main() { 
    ArrayList al = new ArrayList(); 
     
    al.Add('C'); 
    al.Add('A'); 
    al.Add('E'); 
    al.Add('B'); 
    al.Add('D'); 
    al.Add('F'); 
 
    Console.WriteLine(al.IsReadOnly); 
  }
}