public void LeaveCourse(Course course)
{
if (course == null)
{
throw new ArgumentNullException("Course cannot be null");
}
course.RemoveStudent(this);
}
public void JoinCourse(Course course)
{
if (course == null)
{
throw new ArgumentNullException("Course cannot be null");
}
course.AddStudent(this);
}
public void AddCourse(Course course)
{
if (course == null)
{
throw new ArgumentNullException("Course cannot be null");
}
if (this.Courses.Contains(course))
{
throw new InvalidOperationException("This school already contains this course");
}
this.Courses.Add(course);
}
public void RemoveCourse(Course course)
{
if (course == null)
{
throw new ArgumentNullException("Course cannot be null");
}
if (!this.Courses.Contains(course))
{
throw new InvalidOperationException("This school doesnt contains this course");
}
this.Courses.Remove(course);
}