private List <Yonetici> ListAllYonetici()
 {
     try
     {
         using (var YoneticiBussines = new YoneticiBusiness())
         {
             List <Yonetici> Yonetici = YoneticiBussines.SelectAllYonetici();
             return(Yonetici);
         }
     }
     catch (Exception ex)
     {
         LogHelper.Log(LogTarget.File, ExceptionHelper.ExceptionToString(ex), true);
         throw new Exception("Yonetici doesn't exists.");
     }
 }