upload the files via FTP in Silverlight

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Silverlight

how is upload the files via FTP in Silverlight?

in code :

private void btnFtpUpload_Click(object sender, RoutedEventArgs e)
        {
            var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            var args = new SocketAsyncEventArgs();
 
           
            args.RemoteEndPoint = new DnsEndPoint("localhost", 21);
           
          
           args.Completed +=
                delegate
                {
                    Thread.Sleep(1000);
                   SendString("username: xxx",
                               delegate
                               {
                                   SendString("password: xxx", delegate
                                   {
 
                                   }
                               }, socket);
                };
            socket.ConnectAsync(args);
        }

In part that is displayed with Underline font an error occurs!

[Edit] The error occurs were the delegate is added: args.Completed[/Edit]

Please help me