static void Main(string[] args) { Lecture[] array = new[] { new Lecture(DayOfWeek.Saturday, TimeSpan.FromHours(9), "C#"), new Lecture(DayOfWeek.Saturday, TimeSpan.FromHours(10), "C#"), new Lecture(DayOfWeek.Saturday, TimeSpan.FromHours(11), "C#"), new Lecture(DayOfWeek.Friday, TimeSpan.FromHours(10), "ASP.NET") }; Schedule sc = new Schedule(array); Console.WriteLine(sc.NumberofLectures("C#")); // 3 Console.WriteLine(sc.NumberofLectures("ASP.NET")); // 1 Console.WriteLine(sc.GetCurrentCourse()); // C# }