C#

private void button1_Click(object sender, EventArgs e)
        {
            /* Retrieve the device list */
            List<PcapDevice> devices = Pcap.GetAllDevices();

            //Extract a device from the list
            PcapDevice device = devices[2];
            //Register our handler function to the 'packet arrival' event
            device.OnPacketArrival += new SharpPcap.Pcap.PacketArrivalEvent(device_PcapOnPacketArrival);
            //Open the device for capturing
            //true -- means promiscuous mode
            //1000 -- means a read wait of 1000ms
            device.Open(true, 1000);
            Console.WriteLine("-- Listenning on {0}, hit 'Enter' to stop...",
            device.Description);
            //Start the capturing process
            device.StartCapture();
            //Wait for 'Enter' from the user.
            Console.ReadLine();
            //Stop the capturing process
            device.StopCapture();
            //Close the pcap device
            device.Close();

        }

        private static void device_PcapOnPacketArrival(object sender, SharpPcap.Packets.Packet packet)
        {
            DateTime time = packet.PcapHeader.Date;
            int len = packet.Header.Length;
            Console.WriteLine("{0}:{1}:{2},{3} Len={4}",
            time.Hour, time.Minute, time.Second, time.Millisecond, len);
        }