static void Main(string[] args) { GradeBook book = new GradeBook(); book.AddGrade(5); book.AddGrade(6); book.AddGrade(3); book.NameChanged += OnNameChanged; book.Name = "Chris"; book.Name = "Matt"; Console.WriteLine("Grade list:"); Console.WriteLine(book.ShowGrades()); Console.WriteLine("Average:"); Console.WriteLine(book.CalculateAverage()); Console.WriteLine($"Name is {book.Name}"); book.Name = "Popularny Stefanek"; Console.ReadLine(); }