c# network traffic

using System;
using System.Net.NetworkInformation;

class MainClass
{
    static void Main()
    {
        if (!NetworkInterface.GetIsNetworkAvailable())
           return;

        NetworkInterface[] interfaces 
            = NetworkInterface.GetAllNetworkInterfaces();

        foreach (NetworkInterface ni in interfaces)
        {                
            Console.WriteLine("    Bytes Sent: {0}", 
                ni.GetIPv4Statistics().BytesSent);
            Console.WriteLine("    Bytes Received: {0}",
                ni.GetIPv4Statistics().BytesReceived);
        }
    }
}