public IHttpActionResult PostInfoExams([FromBody] InfoExamsDto infoExamsDto)
        {
            if (!ModelState.IsValid)
            {
                DateTime datetime = infoExamsDto.GetDateTime();
                var      temp     = _dbContext.FocusExamses.Select(a => a.DateTime);

                if (!_dbContext.FocusExamses.Any(a => a.SemesterId == infoExamsDto.SemesterId && a.SemesterId == infoExamsDto.SemesterId && a.YearId == infoExamsDto.YearId && a.Grade == infoExamsDto.Grade && a.SubjectId == infoExamsDto.SubjectId && a.Mark == infoExamsDto.Mark))
                {
                    if (!_dbContext.FocusExamses.Any(a => a.DateTime.Hour == datetime.Hour && a.DateTime == datetime))
                    {
                        var        Id         = _dbContext.FocusExamses.Count() + 1;
                        FocusExams focusExams = new FocusExams
                        {
                            DateTime   = infoExamsDto.GetDateTime(),
                            Grade      = infoExamsDto.Grade,
                            Id         = "KT" + Id,
                            Mark       = infoExamsDto.Mark,
                            Name       = infoExamsDto.Name,
                            SemesterId = infoExamsDto.SemesterId,
                            SubjectId  = infoExamsDto.SubjectId,
                            YearId     = infoExamsDto.YearId
                        };
                        _dbContext.FocusExamses.Add(focusExams);
                        _dbContext.SaveChanges();
                        return(Ok());
                    }
                    return(BadRequest("Trùng giờ thi với kỳ thi khác"));
                }
                return(BadRequest("Đã có kỳ thi này xin kiểm tra lại!"));
            }
            return(BadRequest(ModelState));
        }
        public IHttpActionResult GetStudent([FromBody] FocusExams focusExams)
        {
            var listStudent   = _dbContext.ClassStudent.Include("Student").Include("Class").Where(a => a.Class.name_Class.Contains(focusExams.Grade)).ToList();
            var listClass     = _dbContext.Classes.Where(a => a.name_Class.Contains(focusExams.Grade)).ToList();
            var focusExamsDTO = new FocusExamsDTO
            {
                ClassStudent = listStudent,
                Class        = listClass
            };

            return(Ok(focusExamsDTO));
        }