class Event

     {

         public delegate void tempChange(object sender, EventArgs e);

         public event tempChange OntempChange;

         string temp;

         public string Temp

         {

             get

             {

                 return temp;

             }

             set

             {

                 if (temp != value)

                 {

                     OntempChange(this, new EventArgs());

                 }

                 temp = value;

             }

         }

     }

        static Event ven;

        static void Main(string[] args)

        {

            ven = new Event();

            ven.OntempChange += new Event.tempChange(ven_OntempChange);

            for (int i = ; i < ; i++)

            {

                ven.Temp = i +"aaa";

                Thread.Sleep();

            }

        }

        static void ven_OntempChange(object sender, EventArgs e)

        {

            Console.WriteLine(ven.Temp +"\r");

        }