public string PostFile(string FilePath,string user,string codeid, Encoding encoding, ProgressBar p)

        {

            string strResult = string.Empty;

            string param = "userid" + "=" + user + "&" +"code" + "=" + codeid + "&" + "Photo" + "=";

            HttpWebRequest myRequest = (HttpWebRequest)HttpWebRequest.Create(PostUrl);

            myRequest.Method = "Post";

            myRequest.KeepAlive = true;

            myRequest.ContentType = "application/x-www-form-urlencoded";  

            myRequest.Accept = "*/*";



            byte[] PostArray = encoding.GetBytes(param);

            FileStream Filestream = new FileInfo(FilePath).OpenRead();

            BinaryReader oReader = new BinaryReader(Filestream);

            byte[] imgdata = oReader.ReadBytes(Convert.ToInt32(Filestream.Length));



            byte[] data = new byte[PostArray.Length + imgdata.Length];

        

            myRequest.ContentLength = PostArray.Length + imgdata.Length;



            PostArray.CopyTo(data, 0);

            imgdata.CopyTo(data, PostArray.Length); 

            Stream PostStream = myRequest.GetRequestStream();

            PostStream.Write(data, 0, data.Length);          

            PostStream.Close();

            ////获取服务器端的响应

            WebResponse webRespon;

            try

            {

                 webRespon = myRequest.GetResponse();

            }

            catch (WebException ex)

            {

                 webRespon = (HttpWebResponse)ex.Response;