accessing gmail imap

dummy = Encoding.ASCII.GetBytes("$ XLIST \"\" \"*\"  \r\n");
 byte[] dummy ;
   System.Net.Sockets.TcpClient tcpc = new System.Net.Sockets.TcpClient("imap.gmail.com", 993);
            System.Net.Security.SslStream ssl = new System.Net.Security.SslStream(tcpc.GetStream());
ssl.Write(dummy, 0, dummy.Length);
buffer = new byte[2048];
bytes = ssl.Read(buffer, 0, 2048);
ssl.Flush();
 dummy = Encoding.ASCII.GetBytes("$ LOGOUT \r\n");
            ssl.Write(dummy, 0, dummy.Length);