public IView AddLecture(int courseId, string lectureName)
{
if (!this.HasCurrentUser)
{
throw new ArgumentException("There is no currently logged in user.");
}
if (!this.User.IsInRole(Role.Lecturer))
{
throw new DivideByZeroException("The current user is not authorized to perform this operation.");
}
ICourse course = this.GetCourse(courseId);
course.AddLecture(new Lecture("lectureName"));
return(this.View(course));
}