public int Delete(int id)
        {
            seat_exam_details exam = db.seat_exam_details.Where(x => x.exam_detail_id == id).FirstOrDefault <seat_exam_details>();

            db.seat_exam_details.Remove(exam);
            return(db.SaveChanges());
        }
        public int Insert(ExamDetailsViewModel repo)
        {
            seat_exam_details exam_Info = new seat_exam_details()
            {
                building_id  = repo.building_id,
                classroom_id = repo.classroom_id,
                exam_id      = repo.exam_id,
                roll_no_from = repo.roll_no_from,
                roll_no_to   = repo.roll_no_to,
                college_name = repo.college_name,
            };

            db.seat_exam_details.Add(exam_Info);
            return(db.SaveChanges());
        }