با سلام در صورتی که یک فایل مثلا با حجم 2 گیگ داشته باشم و در سرور A  باشد و برنامه mvc  من در سرور B باشد در صورتی که که قصد داشته باشم که این فایل را که در سرور A  است دانلود کنم چطور باید عمل کنم ؟ 

Download file in chunks

کد زیر عمل نمی کند 

        private async void down(string url)
        {
            Stream stream = null;

            //This controls how many bytes to read at a time and send to the client
            int bytesToRead = 10000;

            // Buffer to read bytes in chunk size specified above
            byte[] buffer = new Byte[bytesToRead];

            // The number of bytes read
            try
            {
                //Create a WebRequest to get the file
                HttpWebRequest fileReq = (HttpWebRequest)HttpWebRequest.Create(url);

                //Create a response for this request
                HttpWebResponse fileResp = (HttpWebResponse)fileReq.GetResponse();

                if (fileReq.ContentLength > 0)
                    fileResp.ContentLength = fileReq.ContentLength;

                //Get the Stream returned from the response
                stream = fileResp.GetResponseStream();

                // prepare the response to the client. resp is the client Response
                var resp = _httpContextAccessor.HttpContext.Response;

                //Indicate the type of data being sent
                resp.ContentType = "application/octet-stream";

                //Name the file
                resp.Headers.Add("Content-Disposition", "attachment; filename=\"" + "filename.mp4" + "\"");
                resp.Headers.Add("Content-Length", fileResp.ContentLength.ToString());

                int length;
                do
                {
                    // Verify that the client is connected.
                    if (HttpContext.RequestAborted.IsCancellationRequested == false)
                    {

                        // Read data into the buffer.
                        length = stream.Read(buffer, 0, bytesToRead);
                        // fileReq.AddRange("byte", length, fileResp.ContentLength);

                        // and write it out to the response's output stream
                        await resp.Body.WriteAsync(buffer, 0, length);

                        // Flush the data
                        resp.Body.Flush();

                        //Clear the buffer
                        buffer = new Byte[bytesToRead];
                    }
                    else
                    {
                        // cancel the download if client has disconnected
                        length = -1;
                    }
                } while (length > 0); //Repeat until no data is read
            }
            finally
            {
                if (stream != null)
                {
                    //Close the input stream
                    stream.Close();
                }
            }
        }

با تشکر