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Picky Tcp Listener

/* C# Network Programming  by Richard Blum Publisher: Sybex  ISBN: 0782141765 */ using System; using System.Net; using System.Net.Sockets; using System.Security; using System.Security.Permissions; using System.Text; [SocketPermission(SecurityAction.Deny, Access="Accept", Host="0.0.0.0",       Port="9050", Transport="All")] [SocketPermission(SecurityAction.Deny, Access="Accept", Host="0.0.0.0",       Port="9051", Transport="All")] [SocketPermission(SecurityAction.Deny, Access="Accept", Host="0.0.0.0",       Port="9052", Transport="All")] public class PickyTcpListener {    public static void Main()    {       int recv;       TcpListener newsock = null;       byte[] data = new byte[1024];       Console.Write("Enter port number to use: ");       string stringPort = Console.ReadLine();       int port = Convert.ToInt32(stringPort);       try       {          newsock = new TcpListener(port);          newsock.Start();       } catch (SecurityException)       {          Console.WriteLine("Sorry, that port is unavailable");          return;       }       Console.WriteLine("Waiting for a client...");       TcpClient client = newsock.AcceptTcpClient();       NetworkStream ns = client.GetStream();       string welcome = "Welcome to my test server";       data = Encoding.ASCII.GetBytes(welcome);       ns.Write(data, 0, data.Length);       while(true)       {          data = new byte[1024];          recv = ns.Read(data, 0, data.Length);          if (recv == 0)             break;                  Console.WriteLine(                   Encoding.ASCII.GetString(data, 0, recv));          ns.Write(data, 0, recv);       }       ns.Close();       client.Close();       newsock.Stop();    } }