private void FilterTimetable()
{
TimetableCourseProject Context = new TimetableCourseProject();
TimetableDatabase = new ObservableCollection <Timetable>(Context.Timetable.ToList());
if (Timetable != null)
{
Timetable.Clear();
if (TimetableDatabase.Count != 0)
{
foreach (var obj in TimetableDatabase)
{
if (FilterTimetable(obj))
{
Timetable.Add(obj);
}
}
}
}
}