Csharp/C Sharp by API/System.Net.NetworkInformation/NetworkChange

NetworkChange.NetworkAddressChanged

  
using System;
using System.Net.NetworkInformation;
class MainClass
{
    
    private static void NetworkAddressChanged(object sender, EventArgs e)
    {
        Console.WriteLine("Current IP Addresses:");
        foreach (NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces())
        {
            foreach (UnicastIPAddressInformation addr in ni.GetIPProperties().UnicastAddresses) {
                Console.WriteLine("{0}", addr.Address );
            }
        }
    }
    public static void Main(string[] args)
    {
        NetworkChange.NetworkAddressChanged += NetworkAddressChanged;
    }
}

NetworkChange.NetworkAvailabilityChanged

  
using System;
using System.Net.NetworkInformation;
class MainClass
{
    
    private static void NetworkAvailabilityChanged(object sender, NetworkAvailabilityEventArgs e)
    {
        if (e.IsAvailable)
        {
            Console.WriteLine("Network Available");
        }
        else
        {
            Console.WriteLine("Network Unavailable");
        }
    }
    static void Main(string[] args)
    {
        NetworkChange.NetworkAvailabilityChanged +=  NetworkAvailabilityChanged;
    }
}