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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace event_driven_console
{
    public delegate void NotifyGpaDelegate(int GPAScore); // *


    class Student
    {
        public event NotifyGpaDelegate Notify; // *

        public String Name { get; set; }

        private int gpaScore;

        public int GPAScore
        {
            get { return gpaScore; }
            set
            {
                gpaScore = value;
                if (Notify != null)
                    Notify(GPAScore);
            }
        }

    }

    class Teacher
    {
        public string Name { get; set; }
        public void Notify(int pGPAScore)
        {
            Console.WriteLine(
                String.Format("Hello {0}, Your student take the {1} score", 
                Name, pGPAScore));
        }
    }

    class Parent
    {
        public String Name { get; set; }
        public void Notify(int pGPAScore)
        {
            Console.WriteLine(
                String.Format("{0} notified about the GPA {1}", 
                Name, pGPAScore));
        }
    }


    class Program
    {
        static void Main(string[] args)
        {
            var student = new Student();
            student.Name = "James";

            var parent = new Parent();
            parent.Name = "Daddy Cool";


            var mathteacher = new Teacher
            {
                Name = "Math Teacher",
            };

            var physicsteacher = new Teacher
            {
                Name = "Physics Teacher",
            };

            student.Notify += new NotifyGpaDelegate(parent.Notify);
            student.Notify += new NotifyGpaDelegate(mathteacher.Notify);
            student.Notify += new NotifyGpaDelegate(physicsteacher.Notify);

            student.GPAScore = 80;

            Console.Read();
        }
    }
}

Daddy Cool notified about the GPA 80
Hello Math Teacher, Your student take the 80 score
Hello Physics Teacher, Your student take the 80 score