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