//удаление заявки
 public JsonResult DeleteClaim(int id)
 {
     bool isComplete;
     try
     {
         var user = GetUser();
         var db = new DbEngine();
         isComplete = db.DeleteTenderClaim(id, user);
     }
     catch (Exception)
     {
         isComplete = false;
     }
     return Json(new { IsComplete = isComplete }, JsonRequestBehavior.AllowGet);
 }