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foreach (PcapDevice device in LivePcapDeviceList.Instance)
  Console.WriteLine(device.Description);                    

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private void StartDeviceCapture(PcapDevice capturedDevice)
{
  capturedDevice.OnPacketArrival += new PacketArrivalEventHandler(capturedDevice_OnPacketArrival);
  capturedDevice.Open();
  capturedDevice.StartCapture();// device.PcapStartCapture();
}

private void StopDeviceCapture(PcapDevice capturedDevice)
{
  capturedDevice.StopCapture();
  capturedDevice.Close();
}

private void capturedDevice_OnPacketArrival(object sender, CaptureEventArgs e)
{
  Packet packet = Packet.ParsePacket(e.Packet);
  if (packet is TcpPacket)
  { 
    //lese Informationen aus              
  }
}