Ftp Upload File

This is my code snippet for file upload. The problem is after all the bytes are written on the server, while doing requestStream.Close() I get error as underlying connection was closed.

               FtpWebRequest request = (FtpWebRequest)WebRequest.Create(serverUri);
                request.UsePassive = false;
                request.Method = WebRequestMethods.Ftp.UploadFile;        
                request.Credentials = new NetworkCredential("xyz", "xyz");                  

                Stream requestStream = request.GetRequestStream();

                const int bufferLength = 2048;
                byte[] buffer = new byte[bufferLength];
                int count = 0;
                int readBytes = 0;
                FileStream stream = File.OpenRead(fileName);

                do
                {
                    readBytes = stream.Read(buffer, 0, bufferLength);
                    requestStream.Write(buffer, 0, readBytes);
                    count += readBytes;                
                }
                while (readBytes != 0);

                requestStream.Flush();              
                requestStream.Close();//get an error here. Also dont think I can avoid this                                                                //statement.

    

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