Şafak Ünel (Matematik Mühendisi)

    public class CustomEventArgs : EventArgs
    {
        public int PersonId { get; set; }
        public string FieldName { get; set; }
        public string NewValue { get; set; }
    }

    class Person
    {
        public event EventHandler<CustomEventArgs> PersonHasChanged;

        public int PersonId { get; set; }
        private string _name;
        public string Name
        {
            get { return _name; }
            set
            {
                _name = value;
                //eger method set edildi ise
                if (PersonHasChanged != null)
                {
                    CustomEventArgs c = new CustomEventArgs();
                    c.PersonId = this.PersonId;
                    c.FieldName = "Name";
                    c.NewValue = value;
                    PersonHasChanged(this, c);
                }
            }
        }

    }
    public class CustomEventArgs : EventArgs
    {
        public int PersonId { get; set; }
        public string FieldName { get; set; }
        public string NewValue { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Person p1 = new Person() { PersonId = 1, Name = "Safak" };
            p1.PersonHasChanged += ShowChangedUser;
            p1.PersonHasChanged += SendChangedUserInformation;
            p1.Name = "Test";

            Console.ReadLine();

        }

        static void ShowChangedUser(object sender, CustomEventArgs e)
        {
            Console.WriteLine(@"Person ID: {0} Field: {1} 
                    New Value: {2}", e.PersonId, e.FieldName, e.NewValue);
        }

        static void SendChangedUserInformation(object sender
                , CustomEventArgs e)
        {
            Console.WriteLine(@"Person ID: {0} Bilgilendirme maili 
                    gonderiliyor", e.PersonId, e.FieldName, e.NewValue);
        }
    }