private bool IsLessonTeacher(DateTime date, LessonsOrder lesson, Teacher teacher)
{
bool b = false;
if (items.ContainsKey(date))
{
foreach (ScheduleItem s in items[date])
{
if (s.Lesson == lesson && s.Teachsrs.Contains<Teacher>(teacher))
{
b = true;
break;
}
}
}
return b;
}
public void AddTeacher(Teacher t)
{
teachers.Add(t);
}