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void connectbuttonclick (object sender, EventArgs e)
{     
    FtpClient client = new FtpClient();
                                           
    client.Host = ****;
    client.Port = *****;
    client.Credentials = new NetworkCredential(user, pass);
    client.Connect();
    client.BeginGetListing(new AsyncCallback(GetListingCallback), client);
}

static void GetListingCallback(IAsyncResult ar) {
            FtpClient client = ar.AsyncState as FtpClient;

            try {
                if (client == null)
                    throw new InvalidOperationException("The FtpControlConnection object is null!");

                foreach (FtpListItem item in client.EndGetListing(ar))
                  Console.WriteLine(item);
            }
            catch (Exception ex) {
                Console.WriteLine(ex.ToString());
            }
            finally {
              System.Threading.Thread.Sleep(10);
            }					

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client.Execute("PRET LIST"));
client.Execute("PASV");             
client.Execute("LIST -al");					

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230 Administrator logged in successfully.
FEAT
211-Extensions supported:
 PRET
 AUTH SSL
 PBSZ
 CPSV
 SSCN
 MLST type*,x.crc32*,size*,modify*,unix.owner*,unix.group*,x.slaves*,x.xfertime*
 CLNT
 NOOP
211 End
Text encoding: System.Text.ASCIIEncoding
PRET LIST
200 OK, will use master for upcoming transfer
PASV
227 Entering Passive Mode (192,168,80,128,7,212).
LIST -al
150 File status okay; about to open data connection.					

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[R] PRET LIST
[R] 200 OK, will use master for upcoming transfer
[R] PASV
[R] 227 Entering Passive Mode (192,168,80,128,7,217).
[R] Opening data connection IP: **.***.**.** PORT: 2009
[R] LIST -al
[R] 150 File status okay; about to open data connection.