public class Student
    {
        private string name;
        private int age;

        // This is just a template.
        public delegate void PropertyChangedHandler(PropertyChangedEventArgs args);

        // Our public event( array of methods, functions...), based on our template!
        public event PropertyChangedHandler OnPropertyChanged;

        public Student () { }

        public string Name
        {
            get { return this.name; }
            set
            {
                // Our template accepts instance of class "PropertyChangedEventArgs"
                // Create instance and pass it to the event
                var eventArgs = new PropertyChangedEventArgs ("name", this.name, value);

                this.name = value;
                OnPropertyChanged (eventArgs);
            }
        }

        public int Age
        {
            get { return this.age; }
            set
            {
                // Our template accepts instance of class "PropertyChangedEventArgs"
                // Create instance and pass it to the event
                var eventArgs = new PropertyChangedEventArgs ("age", this.age, value);

                this.age = value;
                OnPropertyChanged (eventArgs);
            }
        }
    }