How to Ping a Website or Server Asynchronously

Why?

Sometimes, you need to know whether a Server is down.

Code:

private void btnPing_Click(object sender, RoutedEventArgs e)
{          
    PingAsync("www.google.com", "I send myself to the callback method");
}

private static void PingAsync(string hostName, object toBeSent)
{
    var pinger = new Ping();

    pinger.PingCompleted += pinger_PingCompleted;

    pinger.SendAsync(hostName, toBeSent);
}
private static void pinger_PingCompleted(object sender, PingCompletedEventArgs e)
{
    PingReply reply = e.Reply;

    DisplayPingReplyInfo(reply);

    if (e.Cancelled)
    {
        Console.WriteLine("Ping for " + e.UserState.ToString() + " was cancelled");
    }
    else if (e.Error != null)
    {
        Console.WriteLine("Exception thrown during ping: {0}", e.Error.ToString());
    }
}
private static void DisplayPingReplyInfo(PingReply reply)
{
    Console.WriteLine("Results from pinging " + reply.Address);
    Console.WriteLine("\tFragmentation allowed?: {0}", !reply.Options.DontFragment);
    Console.WriteLine("\tTime to live: {0}", reply.Options.Ttl);
    Console.WriteLine("\tRoundtrip took: {0}", reply.RoundtripTime);
    Console.WriteLine("\tStatus: {0}", reply.Status.ToString());
}

Unsuccessful Ping:

If a computer is not reached successfully by the ping request, it does not necessarily mean that the computer is unreachable. Many factors can prevent a ping from succeeding such as:

• The machine being offline
• Network topology
• Firewalls
• Packet filters
• Proxy servers

More details:

• http://msdn.microsoft.com/en-us/library/system.net.networkinformation.ping.aspx