public static class Extensions
  {
      public static void PostFormAsync(this HttpWebRequest request, object parameters, AsyncCallback callback)
      {
          request.Method = "POST";
          request.ContentType = "application/x-www-form-urlencoded";
          request.BeginGetRequestStream(new AsyncCallback(asyncResult =>
          {
              Stream stream = request.EndGetRequestStream(asyncResult);
              DataContractQueryStringSerializer ser = new DataContractQueryStringSerializer();
              ser.WriteObject(stream, parameters);
              stream.Close();
              request.BeginGetResponse(callback, request);
          }), request);
      }

      public static void PostMultiPartAsync(this HttpWebRequest request, object parameters, AsyncCallback callback)
      {
          request.Method = "POST";
          string boundary = "---------------" + DateTime.Now.Ticks.ToString();
          request.ContentType = "multipart/form-data; boundary=" + boundary;
          request.BeginGetRequestStream(new AsyncCallback(asyncResult =>
          {
              Stream stream = request.EndGetRequestStream(asyncResult);

              DataContractMultiPartSerializer ser = new DataContractMultiPartSerializer(boundary);
              ser.WriteObject(stream, parameters);
              stream.Close();
              request.BeginGetResponse(callback, request);
          }), request);
      }
  }