Wince 5.0上进行的ftp下传操作出现有关问题了

Wince 5.0下进行的ftp上传操作出现问题了

        private void PutFile(string filename)
        {         
            FileInfo fileInf = new FileInfo(filename);
            FtpRequestCreator creator = new FtpRequestCreator();
            WebRequest.RegisterPrefix("ftp:", creator);
            Uri testUri = new Uri(ftpURI);
            FtpWebRequest reqFTP = (FtpWebRequest)WebRequest.Create(testUri+fileInf.Name);
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            FtpWebResponse rpeFTP = (FtpWebResponse)reqFTP.GetResponse();
            //int buffLength = 2048;         
            // byte[] buff = new byte[buffLength];
            byte[] buff = new byte[fileInf.Length];
            //int contentLen;
            FileStream fs = fileInf.OpenRead();
            fs.Read(buff, 0,Convert.ToInt32(fileInf.Length));
            Stream strm = reqFTP.GetRequestStream();
            strm.Write(buff, 0, buff.Length);
            strm.Close();
            fs.Close();
            MessageBox.Show("File uploaded");
        }