public JsonResult GetClassStudentsList(Guid classId)
        {
            try
            {
                var result = StudentAffarisHelper.GetClassStudentInfos(classId);
                return(Json(new { flag = true, result = result }, JsonRequestBehavior.AllowGet));
            }
            catch (Exception e)
            {
                return(Json(new { flag = false, message = e.Message }, JsonRequestBehavior.AllowGet));

                throw;
            }
        }