private void FilterFaculties() { TimetableCourseProject Context = new TimetableCourseProject(); FacultiesDatabase = new ObservableCollection <Faculties>(Context.Faculties.ToList()); context.Faculties.Load(); if (Faculty != null) { Faculty.Clear(); if (FacultiesDatabase.Count != 0) { foreach (var obj in FacultiesDatabase) { if (FilterFaculties(obj)) { Faculty.Add(obj); } } } } }