public bool AddSaveDate(Models.save_date s)
 {
     try
     {
         using (QLBH_PHONE_ENTITY data = new QLBH_PHONE_ENTITY())
         {
             data.save_date.Add(s);
             data.SaveChanges();
             return(true);
         }
     }
     catch (Exception e)
     {
         Debug.WriteLine(e);
         return(false);
     }
 }
 public bool UpdateSaveDate(Models.save_date s)
 {
     try
     {
         using (QLBH_PHONE_ENTITY data = new QLBH_PHONE_ENTITY())
         {
             var saveDate = data.save_date.Single(p => p.id == s.id);
             saveDate.id         = s.id;
             saveDate.date_start = s.date_start;
             saveDate.date_end   = s.date_end;
             saveDate.id_save    = s.id_save;
             saveDate.content    = s.content;
             data.SaveChanges();
             return(true);
         }
     }
     catch (Exception e)
     {
         Debug.WriteLine(e);
         return(false);
     }
 }