public string updateCustomer(Customer customer)
 {
     try
     {
         customerDAO = new CustomerDAO();
         return customerDAO.updateCustomer(customer);
     }
     catch (BusinessException e)
     {
         throw e;
     }
     catch (PlatformException e)
     {
         throw e;
     }
     catch (Exception e)
     {
         throw new PlatformException(e.Message);
     }
 }