post a file to server using REST services

static void PostData()
        {
            
            try
            {
                // Create a http request to the server endpoint that will pick up the
                // file and file description.
                HttpWebRequest requestToServerEndpoint = (HttpWebRequest)WebRequest.Create("http://192.168.4.226:80/era/applications?appid=909_99");             
                          

                string boundaryString = String.Format("----------{0:N}", Guid.NewGuid());
                string fileUrl = @"C:\Users\filename-1.0.par";
                // Set the http request header \\
                requestToServerEndpoint.Method = WebRequestMethods.Http.Post;
                requestToServerEndpoint.ContentType = "multipart/form-data; boundary=" + boundaryString;
                requestToServerEndpoint.KeepAlive = true;
                NetworkCredential nc = new NetworkCredential("admin", "admin");
                requestToServerEndpoint.Credentials = nc;

                MemoryStream postDataStream = new MemoryStream();
                StreamWriter postDataWriter = new StreamWriter(postDataStream);

                // Include value from the myFileDescription text area in the post data
                //postDataWriter.Write("\r\n--" + boundaryString + "\r\n");
                //postDataWriter.Write("Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}",
                // "package.par", "package.par");

                // Include the file in the post data
  postDataWriter.Write("\r\n--" + boundaryString + "\r\n");
                postDataWriter.Write("Content-Disposition: form-data;"
                                        + "name=\"{0}\";"
                                        + "filename=\"{1}\""
                                        + "\r\nContent-Type: {2}\r\n\r\n",
                                        "package.par", Path.GetFileName(fileUrl),
                                        Path.GetExtension(fileUrl));
                postDataWriter.Flush();

                //read

                FileStream fileStream = new FileStream(fileUrl, FileMode.Open, FileAccess.Read);
                byte[] buffer = new byte[1024];
                int bytesRead = 0;
                while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                {
                    postDataStream.Write(buffer, 0, bytesRead);
                }
                fileStream.Close();
                //////////
              postDataWriter.Write("\r\n--" + boundaryString + "--\r\n");
                postDataWriter.Flush();

                // Set the http request body content length
                requestToServerEndpoint.ContentLength = postDataStream.Length;

                // Dump the post data from the memory stream to the request stream
                using (Stream s = requestToServerEndpoint.GetRequestStream())
                {
                    postDataStream.WriteTo(s);
                }
                postDataStream.Close();

                //////response
              bool b=  requestToServerEndpoint.HaveResponse;
                
                WebResponse response = requestToServerEndpoint.GetResponse();
                StreamReader responseReader = new StreamReader(response.GetResponseStream());
                string replyFromServer = responseReader.ReadToEnd();
                HttpWebResponse response2 = (HttpWebResponse)requestToServerEndpoint.GetResponse();
                string returnString = response2.StatusCode.ToString();
                System.Console.WriteLine("response=" + returnString);
                if (returnString.Equals("OK"))
                {
                    System.Console.WriteLine("Request Successful");
                }
                else
                {
                    System.Console.WriteLine("Request Unsuccessful");
                }
            }
            catch (WebException wex)
            {
                Stream c = wex.Response.GetResponseStream();

                System.Console.WriteLine("Exception=" + wex.Message);

                // Exception message and stack trace
                Console.WriteLine(wex.Message);
                Console.WriteLine(wex.StackTrace);

                // Inspect the reason of communication failure
                switch (wex.Status)
                {
                    case WebExceptionStatus.ConnectFailure:
                        // handle failure to connect to server
                        break;

                    case WebExceptionStatus.ReceiveFailure:
                        // handle failure to receive complete
                        // HTTP response from server
                        break;

                    case WebExceptionStatus.Timeout:
                        // handle timeout when waiting for
                        // HTTP response from server
                        break;

                    case WebExceptionStatus.ConnectionClosed:
                        // handle connection with server closed
                        // prematurely
                        break;

                    // This is where we can examine HTTP status
                    // codes other than 2xx and the server response
                    // body
                    case WebExceptionStatus.ProtocolError:
                        // Examine the HTTP response returned
                        HttpWebResponse response = (HttpWebResponse)wex.Response;
                        StreamReader responseReader =
                            new StreamReader(response.GetResponseStream());
                        string responseFromServer = responseReader.ReadToEnd();
                        switch (response.StatusCode)
                        {
                            case HttpStatusCode.BadRequest:
                                // handle bad request (http status code 400)
                                break;
                            case HttpStatusCode.InternalServerError:
                                // handle internal server error (http status code 500)
                                break;
                            default:
                                // handle other http status code returned by
                                // the server.
                                break;
                        } // end switch(res.StatusCode)
                        response.Close();
                        break;

                    case WebExceptionStatus.NameResolutionFailure:
                        // handle DNS error
                        break;

                    default:
                        // handle other errors not in this switch statement
                        break;
                }
            }
        }