Using TCPClient with RAW FTP to retrieve file

I get the following message back when trying to retrieve a file using TCPClient and RAW FTP:

425 Failed to establish connection.

I connect using :

using (TcpClient client = new TcpClient("ServerName", 21))
using (NetworkStream stream = client.GetStream())
using (StreamReader reader = new StreamReader(stream))
using (StreamWriter writer = new StreamWriter(stream))
{

Then I login to the server fine using USER **** and PASS ***. I manage to change to the correct directory using CWD /**/**, as mentioned this all works fine and i get the expected response messages.

However when the following code executes the message mentioned above is all i receive.

lineToSend = "PASV";
Program.logger.Add("Sending to server: " + lineToSend, 1);
writer.WriteLine(lineToSend);
while (!stream.DataAvailable)
{
    Program.logger.Add(stream.DataAvailable.ToString(), 1);
    Program.logger.Persist();
    Thread.Sleep(1000);

}
lineWeRead = reader.ReadLine();
Program.logger.Add("Received from server: " + lineWeRead, 1);
Program.logger.Persist();

lineToSend = "RETR file.txt";
Program.logger.Add("Sending to server: " + lineToSend, 1);
wri开发者_开发百科ter.WriteLine(lineToSend);
while (!stream.DataAvailable)
{
    Program.logger.Add(stream.DataAvailable.ToString(), 1);
    Program.logger.Persist();
    Thread.Sleep(1000);
}

Program.logger.Add("Loop Exited: " + stream.DataAvailable.ToString(), 1);
Program.logger.Persist();
lineWeRead = reader.ReadLine();
Program.logger.Add("Received from server: " + lineWeRead, 1);
Program.logger.Persist();

I am fairly new to C#.NET and have been asked specifically to use this method of connecting and not the httpWebRequest.

The file I am trying to receive is a text file containing only "Get this message" but will be bigger when used. Any help is much appreciated.

You might want to read up on the FTP protocol. There is not one connection, but two involved. I don't see a data connection anywhere in your code, which is probably where the 425 is coming from.

I agree with the comment -- unless this is a homework-style question, please don't reinvent the wheel here. FTP stinks and this problem has been solved.