' This constructor arbitrarily assigns the local port number.
   Dim udpClient As New UdpClient(11000)
   Try
      udpClient.Connect("www.contoso.com", 11000)

      ' Sends a message to the host to which you have connected.
      Dim sendBytes As [Byte]() = Encoding.ASCII.GetBytes("Is anybody there?")

      udpClient.Send(sendBytes, sendBytes.Length)

      ' Sends message to a different host using optional hostname and port parameters.
      Dim udpClientB As New UdpClient()
      udpClientB.Send(sendBytes, sendBytes.Length, "AlternateHostMachineName", 11000)

      ' IPEndPoint object will allow us to read datagrams sent from any source.
      Dim RemoteIpEndPoint As New IPEndPoint(IPAddress.Any, 0)

      ' UdpClient.Receive blocks until a message is received from a remote host.
      Dim receiveBytes As [Byte]() = udpClient.Receive(RemoteIpEndPoint)
      Dim returnData As String = Encoding.ASCII.GetString(receiveBytes)

      ' Which one of these two hosts responded?
      Console.WriteLine(("This is the message you received " + _
                                    returnData.ToString()))
       Console.WriteLine(("This message was sent from " + _
                                    RemoteIpEndPoint.Address.ToString() + _ 
                                    " on their port number " + _
                                    RemoteIpEndPoint.Port.ToString()))
      udpClient.Close()
      udpClientB.Close()

   Catch e As Exception
      Console.WriteLine(e.ToString())
   End Try
End Sub 

// This constructor arbitrarily assigns the local port number.
UdpClient udpClient = new UdpClient(11000);
    try{
         udpClient.Connect("www.contoso.com", 11000);

         // Sends a message to the host to which you have connected.
         Byte[] sendBytes = Encoding.ASCII.GetBytes("Is anybody there?");

         udpClient.Send(sendBytes, sendBytes.Length);

         // Sends a message to a different host using optional hostname and port parameters.
         UdpClient udpClientB = new UdpClient();
         udpClientB.Send(sendBytes, sendBytes.Length, "AlternateHostMachineName", 11000);

         //IPEndPoint object will allow us to read datagrams sent from any source.
         IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);

         // Blocks until a message returns on this socket from a remote host.
         Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint); 
         string returnData = Encoding.ASCII.GetString(receiveBytes);

         // Uses the IPEndPoint object to determine which of these two hosts responded.
         Console.WriteLine("This is the message you received " +
                                      returnData.ToString());
         Console.WriteLine("This message was sent from " +
                                     RemoteIpEndPoint.Address.ToString() +
                                     " on their port number " +
                                     RemoteIpEndPoint.Port.ToString());

          udpClient.Close();
          udpClientB.Close();

          }  
       catch (Exception e ) {
                  Console.WriteLine(e.ToString());
        }

// With this constructor the local port number is arbitrarily assigned.
UdpClient^ udpClient = gcnew UdpClient;
try
{
   udpClient->Connect( "host.contoso.com", 11000 );

   // Send message to the host to which you have connected.
   array<Byte>^sendBytes = Encoding::ASCII->GetBytes( "Is anybody there?" );
   udpClient->Send( sendBytes, sendBytes->Length );

   // Send message to a different host using optional hostname and port parameters.
   UdpClient^ udpClientB = gcnew UdpClient;
   udpClientB->Send( sendBytes, sendBytes->Length, "AlternateHostMachineName", 11000 );

   //IPEndPoint object will allow us to read datagrams sent from any source.
   IPEndPoint^ RemoteIpEndPoint = gcnew IPEndPoint( IPAddress::Any,0 );

   // Block until a message returns on this socket from a remote host.
   array<Byte>^receiveBytes = udpClient->Receive( RemoteIpEndPoint );
   String^ returnData = Encoding::ASCII->GetString( receiveBytes );

   // Use the IPEndPoint object to determine which of these two hosts responded.
   Console::WriteLine( String::Concat( "This is the message you received ", returnData->ToString() ) );
   Console::WriteLine( String::Concat( "This message was sent from ", RemoteIpEndPoint->Address->ToString(), " on their port number ", RemoteIpEndPoint->Port.ToString() ) );
   udpClient->Close();
   udpClientB->Close();
}
catch ( Exception^ e ) 
{
   Console::WriteLine( e->ToString() );
}