public  Customer UpdateCustomer(Customer customer)
        {
            if (_context.Customers.Local.All(c => c.Id != customer.Id))
            {
                _context.Customers.Attach(customer);
            }
            //_context.Entry(customer).State = EntityState.Modified;
            
            _context.SaveChanges();
            return customer;

        }
 public  Customer AddCustomer(Customer customer)
 {
     _context.Customers.Add(customer);
     _context.SaveChanges();
     return customer;
 }