using System;
using System.Text;

namespace testalot
{
   public class testa
   {
      override public string ToString()
      {
         return ("testa tostring()");
      }
   }

   public class testb
   {
      new public string ToString()
      {
         return ("testb tostring()");
      }
   }

   public class testc
   {
   }

   public static class ToStringExpander
   {
      public static string ToString(this testc x)
      {
         return "testc extender.";
      }

      public static string MyToString(this Object x)
      {
         return x.ToString()+" extended.";
      }

      public static string MyToString(this testc x)
      {
         return "testc extended.";
      }
   }

   class Program
   {
      static void Main(string[] args)
      {
         testa t1 = new testa();
         Console.WriteLine(t1.ToString());
         Console.WriteLine(((Object)t1).ToString());
         Console.WriteLine(t1.MyToString());
         Console.WriteLine(((Object)t1).MyToString());
         Console.WriteLine();

         testb t2 = new testb();
         Console.WriteLine(t2.ToString());
         Console.WriteLine(((Object)t2).ToString());
         Console.WriteLine(t2.MyToString());
         Console.WriteLine(((Object)t2).MyToString());
         Console.WriteLine();

         testc t3 = new testc();
         Console.WriteLine(t3.ToString());
         Console.WriteLine(ToStringExpander.ToString(t3));
         Console.WriteLine(t3.MyToString());
         Console.WriteLine(((Object)t3).MyToString());

         Console.ReadLine();
      }
   }
}