public object listAllexam(string text_search, string status_search, string group_search, string subject_search, string from_search, string to_search, int?move_from, int pageno = 1)
        {
            /*repair test student exam*/
            var curdate    = DateUtil.Now().Date;
            var rtstudents = _context.TestResultStudents.Include(i => i.Test).Where(w => w.ExamingStatus == ExamingStatus.Examing);

            foreach (var rtstudent in rtstudents)
            {
                if (rtstudent.Test != null)
                {
                    var remain = FuncUtil.GetTimeRemaining(rtstudent.Test.TimeLimitType, rtstudent.Test.TimeLimit, rtstudent.Start_On);
                    if (remain <= 0)
                    {
                        rtstudent.ExamingStatus = ExamingStatus.Done;
                        rtstudent.Other         = true;
                        rtstudent.Update_On     = curdate;
                        rtstudent.End_On        = rtstudent.Start_On.Value.AddSeconds(FuncUtil.GetMaxTimeLimit(rtstudent.Test.TimeLimitType, rtstudent.Test.TimeLimit));
                    }
                }
            }
            _context.SaveChanges();

            var exam = _context.Exams.Include(i => i.Test).Include(i => i.Subject).Include(i => i.Subject.SubjectGroup).Where(w => 1 == 1);

            if (move_from.HasValue)
            {
                exam = exam.Where(w => w.ID != move_from & w.ExamDate.Value >= curdate.Date);
            }

            if (!string.IsNullOrEmpty(status_search))
            {
                exam = exam.Where(w => w.Status == status_search.toStatus());
            }

            if (!string.IsNullOrEmpty(subject_search))
            {
                var subjectID = NumUtil.ParseInteger(subject_search);
                if (subjectID > 0)
                {
                    exam = exam.Where(w => w.SubjectID == subjectID);
                }
            }
            if (!string.IsNullOrEmpty(group_search))
            {
                var groupID = NumUtil.ParseInteger(group_search);
                if (groupID > 0)
                {
                    exam = exam.Where(w => w.Subject.SubjectGroupID == groupID);
                }
            }
            if (!string.IsNullOrEmpty(from_search))
            {
                var date = DateUtil.ToDate(from_search);
                exam = exam.Where(w => w.ExamDate.Value.Date >= date);
            }
            if (!string.IsNullOrEmpty(to_search))
            {
                var date = DateUtil.ToDate(to_search);
                exam = exam.Where(w => w.ExamDate.Value.Date <= date);
            }

            var exams = new List <Exam>();

            if (!string.IsNullOrEmpty(text_search))
            {
                var text_splits = text_search.Split(",", StringSplitOptions.RemoveEmptyEntries);
                foreach (var text_split in text_splits)
                {
                    if (!string.IsNullOrEmpty(text_split))
                    {
                        var text = text_split.Trim();

                        var registerIDs = _context.ExamRegisters.Where(w => w.Student.FirstName.Contains(text)
                                                                       | w.Student.LastName.Contains(text)
                                                                       | w.Student.FirstNameEn.Contains(text)
                                                                       | w.Student.LastNameEn.Contains(text)
                                                                       | w.Student.IDCard.Contains(text)
                                                                       | w.Student.Phone.Contains(text)
                                                                       | w.Student.Email.Contains(text)
                                                                       | w.Student.Passport.Contains(text)
                                                                       | w.Student.StudentCode.Contains(text)
                                                                       | (w.Student.FirstName + " " + w.Student.LastName).Contains(text)
                                                                       | (w.Student.FirstNameEn + " " + w.Student.LastNameEn).Contains(text)
                                                                       ).Select(s => s.ExamID);

                        exams.AddRange(exam.Where(w => w.Test.Name.Contains(text)
                                                  | w.ExamCode.Contains(text)
                                                  | registerIDs.Contains(w.ID)
                                                  ));
                    }
                }
                exams = exams.Distinct().ToList();
            }
            else
            {
                exams = exam.ToList();
            }

            int skipRows = (pageno - 1) * 25;
            var itemcnt  = exams.Count();
            var pagelen  = itemcnt / 25;

            if (itemcnt % 25 > 0)
            {
                pagelen += 1;
            }
            return(CreatedAtAction(nameof(listAllexam), new
            {
                data = exams.Select(s => new
                {
                    id = s.ID,
                    test = s.ExamTestType == ExamTestType.Random ? _context.Tests.Where(w => w.SubjectID == s.SubjectID & w.Status == StatusType.Active).Count() == 1 ? _context.Tests.Where(w => w.SubjectID == s.SubjectID & w.Status == StatusType.Active).FirstOrDefault().Name :  "สุ่ม" : s.Test.Name,
                    status = s.Status.toStatusName(),
                    group = s.Subject.SubjectGroup.Name,
                    subject = s.Subject.Name,
                    subjectorder = s.Subject.Order,
                    examcode = s.ExamCode,
                    examdate = DateUtil.ToDisplayDate(s.ExamDate),
                    date = s.ExamDate,
                    examperiod = s.ExamPeriod.toExamPeriodName(),
                    examperiodid = s.ExamPeriod,
                    examtesttype = s.ExamTestType.toExamTestType(),
                    registercnt = s.RegisterCnt,
                    examregistercnt = s.ExamRegisterCnt,
                    create_on = DateUtil.ToDisplayDateTime(s.Create_On),
                    create_by = s.Create_By,
                    update_on = DateUtil.ToDisplayDateTime(s.Update_On),
                    update_by = s.Update_By,
                }).OrderByDescending(o => o.date).ThenBy(o => o.examperiodid).ThenBy(o => o.group).ThenBy(o => o.subjectorder).Skip(skipRows).Take(25).ToArray(),
                pagelen = pagelen,
                itemcnt = itemcnt,
            }));;
        }