Try

     Dim ipAddress As IPAddress = Dns.Resolve("localhost").AddressList(0)
  Dim tcpListener As New TcpListener(ipAddress, portNumber)
  tcpListener.Start()
  
   ' Use the Pending method to poll the underlying socket instance for client connection requests.
   If Not tcpListener.Pending() Then
      
      Console.WriteLine("Sorry, no connection requests have arrived")
   
   Else
      
      'Accept the pending client connection and return a TcpClient object initialized for communication.
      Dim tcpClient As TcpClient = tcpListener.AcceptTcpClient()
      ' Using the RemoteEndPoint property.
      Console.Write("I am listening for connections on ")
      Console.Writeline(IPAddress.Parse(CType(tcpListener.LocalEndpoint, IPEndPoint).Address.ToString())) 
      Console.Write("on port number ")
      Console.Write(CType(tcpListener.LocalEndpoint, IPEndPoint).Port.ToString())
      

        
try{
        // Use the Pending method to poll the underlying socket instance for client connection requests.
            IPAddress ipAddress = Dns.Resolve("localhost").AddressList[0];
         TcpListener tcpListener =  new TcpListener(ipAddress, portNumber); 
         tcpListener.Start();
         
          if (!tcpListener.Pending()) {

          Console.WriteLine("Sorry, no connection requests have arrived");
          
       }
       else{

             //Accept the pending client connection and return a TcpClient object initialized for communication.
             TcpClient tcpClient = tcpListener.AcceptTcpClient();
             // Using the RemoteEndPoint property.
             Console.WriteLine("I am listening for connections on " + 
                                         IPAddress.Parse(((IPEndPoint)tcpListener.LocalEndpoint).Address.ToString()) +
                                            "on port number " + ((IPEndPoint)tcpListener.LocalEndpoint).Port.ToString());

try
{
   // Use the Pending method to poll the underlying socket instance for client connection requests.
   TcpListener^ tcpListener = gcnew TcpListener( portNumber );
   tcpListener->Start();

   if ( !tcpListener->Pending() )
   {
      Console::WriteLine( "Sorry, no connection requests have arrived" );
   }
   else
   {
      //Accept the pending client connection and return a TcpClient object^ initialized for communication.
      TcpClient^ tcpClient = tcpListener->AcceptTcpClient();
      
      // Using the RemoteEndPoint property.
      Console::WriteLine( "I am listening for connections on {0} on port number {1}",
         IPAddress::Parse( ( (IPEndPoint^)(tcpListener->LocalEndpoint) )->Address->ToString() ),
         ( (IPEndPoint^)(tcpListener->LocalEndpoint) )->Port );

try {
    // Use the Pending method to poll the underlying socket instance
    // for client connection requests.
    IPAddress ipAddress = Dns.Resolve("localhost").get_AddressList()[0];
    TcpListener tcpListener = new TcpListener(ipAddress, portNumber);
    tcpListener.Start();

    if (!(tcpListener.Pending())) {
        Console.WriteLine("Sorry, no connection requests have arrived");
    }
    else {
        //Accept the pending client connection and return a TcpClient
        //object initialized for communication.
        TcpClient tcpClient = tcpListener.AcceptTcpClient();
        // Using the RemoteEndPoint property.
        Console.WriteLine("I am listening for connections on "
            + IPAddress.Parse(((IPEndPoint)
            (tcpListener.get_LocalEndpoint())).get_Address().ToString())
            + "on port number " + ((Int32)((IPEndPoint)
            (tcpListener.get_LocalEndpoint())).get_Port()).ToString());