public async Task<byte[]> Send(string fileName)
        {
            var user = _configuration["Sftp:User"];
            var password = _configuration["Sftp:Password"];
                        
            using (WebClient webClient = new WebClient())
            {
                webClient.Credentials = new NetworkCredential(user, password);
                return await webClient.UploadFileTaskAsync(...);
            }
        }

[HttpGet]
        [Route("xmltosend/{id}")]
        public async Task<IActionResult> SendXml(long id)
        {
            var ordine = await _ordersRepository.GetOrder(id);
            var response = await _sftpService.Send(order.XmlName);
             
            if(response.Length==0) throw new SendXmlException();
           
            return Ok(id);
        }