public async Task <IActionResult> PutCustomer(int id, Customer customer)
        {
            if (id != customer.Id)
            {
                return(BadRequest());
            }

            _context.Entry(customer).State = EntityState.Modified;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!CustomerExists(id))
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }

            return(NoContent());
        }
        public async Task <IActionResult> PutOrderLine(int id, OrderLine orderLine)
        {
            if (id != orderLine.Id)
            {
                return(BadRequest());
            }

            _context.Entry(orderLine).State = EntityState.Modified;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!OrderLineExists(id))
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }

            return(NoContent());
        }
        public async Task <IActionResult> PutProduct(int id, Product product)
        {
            if (id != product.Id)
            {
                return(BadRequest());
            }

            _context.Entry(product).State = EntityState.Modified;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!ProductExists(id))
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }

            return(NoContent());
        }