SendDataToSites.FileUploader Method

public static void FileUploader(string url,
     NameValueCollection values,
     string filePath,
     Action<string, int> progress,
     Action<string> completed)
 {
     var fileStream = File.OpenRead(filePath);
     var fileName = Path.GetFileName(filePath);
     var ms = new MemoryStream();
     fileStream.CopyTo(ms);
     ms.Position = 0;
     try
     {
         const string contentType = "application/octet-stream";
         var request = WebRequest.Create(url);
         request.Method = "POST";
         var boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x", NumberFormatInfo.InvariantInfo);
         request.ContentType = "multipart/form-data; boundary=" + boundary;
         boundary = "--" + boundary;
         var dataStream = new MemoryStream();
         byte[] buffer;
         foreach (string name in values.Keys)
         {
             buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine);
             dataStream.Write(buffer, 0, buffer.Length);
             buffer = Encoding.ASCII.GetBytes(string.Format("Content-Disposition: form-data; name=\"{0}\"{1}{1}",
                 name, Environment.NewLine));
             dataStream.Write(buffer, 0, buffer.Length);
             buffer = Encoding.UTF8.GetBytes(values[name] + Environment.NewLine);
             dataStream.Write(buffer, 0, buffer.Length);
         }
         buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine);
         dataStream.Write(buffer, 0, buffer.Length);
         buffer = Encoding.UTF8.GetBytes($"Content-Disposition: form-data; name=\"file\"; filename=\"{fileName}\"{Environment.NewLine}");
         dataStream.Write(buffer, 0, buffer.Length);
         buffer = Encoding.ASCII.GetBytes(string.Format("Content-Type: {0}{1}{1}",
             contentType,
             Environment.NewLine));
         dataStream.Write(buffer, 0, buffer.Length);
         ms.CopyTo(dataStream);
         buffer = Encoding.ASCII.GetBytes(Environment.NewLine);
         dataStream.Write(buffer, 0, buffer.Length);
         buffer = Encoding.ASCII.GetBytes(boundary + "--");
         dataStream.Write(buffer, 0, buffer.Length);
         dataStream.Position = 0;
         request.ContentLength = dataStream.Length;
         var requestStream = request.GetRequestStream();
         var size = dataStream.Length;
         const int chunkSize = 64 * 1024;
         buffer = new byte[chunkSize];
         long bytesSent = 0;
         int readBytes;
         while ((readBytes = dataStream.Read(buffer, 0, buffer.Length)) > 0)
         {
             requestStream.Write(buffer, 0, readBytes);
             bytesSent += readBytes;
             var status = "Uploading... " + bytesSent / 1024 + "KB of " + size / 1024 + "KB";
             var percentage = Convert.ToInt32(100 * bytesSent / size);
             progress(status, percentage);
         }
         using (var response = request.GetResponse())
         using (var responseStream = response.GetResponseStream())
         using (var stream = new MemoryStream())
         {
             responseStream.CopyTo(stream);
             var result = Encoding.Default.GetString(stream.ToArray());
             completed(result == string.Empty
                 ? "failed:" + result
                 : "ok:" + result);
         }
     }
     catch (Exception e) { completed(e.ToString()); }
 }