static void Main(string[] args)
        {
            using (var context = new SchoolDbContext())
            {
                var newStudent = CreateNewStudent(context);

                var newScheduledCourse = CreateNewScheduledCourse(context);
                newScheduledCourse.Students.Add(newStudent);
                newStudent.ScheduledCourses.Add(newScheduledCourse);

                context.SaveChanges();
            }

            Console.WriteLine();
            Console.WriteLine("Press any key to exit.");
            Console.ReadKey();
        }