Model View Presenter Using Dependency Injection and Threading Support

using System;
using System.Collections.Generic;
using System.Text;

namespace MvpExample
{

   public class LogonService : ILogonService
   {
      private INotify mNotifier;
      public LogonService()
      {
         // instead of having it as null
         mNotifier = new EmptyNotify(); 
      }
      public LogonService(INotify notifier)
      {
         mNotifier = notifier;
      }
      public bool Logon(string userName, string password)
      {
         // simulate a long operation, wait 3 seconds.
         System.Threading.Thread.Sleep(TimeSpan.FromSeconds(5));

         bool rc;
         if ((userName == "mike") && (password == "aop"))
         {
            mNotifier.Notify("Logon Successful");
            rc = true;                       
         }
         else
         {
            mNotifier.Notify("Invliad User or Password");
            rc = false;            
         }

         return rc;
      }
      public INotify Notifier
      {
         set { mNotifier = value; }
         get { return mNotifier; }
      }
   }
}