public void UpdateAttendance(DateTime date, int classId, List <List <BCAttendance> > attendance, List <BCTeacherSubject> teacher)
{
_attendanceRepo.DeleteDaysAttendance(date, classId);
int index = 0;
List <BCAttendance> masterList = new List <BCAttendance>();
foreach (List <BCAttendance> a in attendance)
{
int id = teacher[index].BCTeacherSubjectId;
foreach (BCAttendance status in a)
{
status.BCTeacherSubjectId = id;
status.Date = date;
masterList.Add(status);
}
index++;
}
masterList = masterList.Where(a => a.BCTeacherSubjectId != 0).ToList();
_attendanceRepo.AddAttendance(masterList);
}