public static void Main()
{
Student st = new Student("Mariq", 23);
st.OnChange += St_OnChange;
st.Name = "Katq";
st.Age = 51;
}
private static void St_OnChange(Student student, PropertyChangedEventArgs eventArgs)
{
Console.WriteLine($"Property changed: {eventArgs.PropName} (from {eventArgs.OldValue} to {eventArgs.NewValue})");
}
