public void RemoveTeacher(Teacher teacher)
{
var teacherDiscipline = TeacherDisciplines.FirstOrDefault(x => x.Teacher.Id == teacher.Id);
if (teacherDiscipline == null)
{
throw new ArgumentException("Teacher must be into discipline list.");
}
TeacherDisciplines.Remove(teacherDiscipline);
}
public void AddTeacher(Teacher teacher)
{
TeacherDisciplines.Add(new TeacherDiscipline(this, teacher));
}
