using System;

class Test{
   static void Main(){
       new Test().test();
   }
   void test(){
       f("aa");
       f_ = delegate(String s) { };
       f("bb");
   }

   public Action<String> f { get { return f_; } }
   private Action<String> f_ = delegate(String s){
       Console.WriteLine(s);
   };
}