Multiply FTP Sessions in Background Workers

[Elina Lazebnik]

I use a Background Workers for open multiply FTP Connections to same FTP Server. I use Active FTP Mode and use a asynchronous requests. When I start 2 connections together, the first one is working properly and the second isn't receive Data ( connection established ). When I run two applications with one FTP Session for each, I haven't any problems. I'm connect to 21 port. Haw can I change a Data port selection in Active FTP mode for different sessions, or may be this is another problem.

This is a part of request code (21- the port ):

// sPath =  "ftp://user_name:user_pass@server_address:21//path")
                FtpWebRequest request = (FtpWebRequest)WebRequest.Create( sPath );  
                request.UsePassive = false;
                request.Proxy = null;
                request.Method = WebRequestMethods.Ftp.GetFileSize;

                this.curFTPState.FileName = Path.Combine(sPathTo, filename);
                this.curFTPState.FTPMethod = WebRequestMethods.Ftp.GetFileSize;
                this.curFTPState.Request = request;


                // Start the asynchronous request.   
                IAsyncResult result = (IAsyncResult)request.BeginGetResponse(new AsyncCallback(RespCallback), curFTPState);

Thanks