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