/// <summary>
/// Gets Id Of Timetable
/// </summary>
/// <returns>absolute id of timetable</returns>
public static int GetIdOfTimetable(Timetable t, SchoolTimetable st)
{
return(t == null ?
-1 :
t.type == Lesson.LessonType.Teacher ? st.TimetablesOfClasses.Count + st.TimetableOfTeachers.IndexOf(t) : st.TimetablesOfClasses.IndexOf(t));
}
