How to receive event when network is connected and also when user logs in

Question

I have a service that runs and I\'d like to receive notification when:

a) the network is connected.

b) when a user logs in to the machine.

How can I do

Answer 1

//using Microsoft.Win32;
//using System.Net.NetworkInformation;
public class SessionChanges
{
    public SessionChanges()
    {
        NetworkChange.NetworkAvailabilityChanged += 
            new NetworkAvailabilityChangedEventHandler(NetworkChange_NetworkAvailabilityChanged);
        SystemEvents.SessionSwitch += new SessionSwitchEventHandler(SystemEvents_SessionSwitch);
    }

    void SystemEvents_SessionSwitch(object sender, SessionSwitchEventArgs e)
    {
        if (e.Reason == SessionSwitchReason.SessionLogon)
        { 
            //user logged in
        }
    }

    void NetworkChange_NetworkAvailabilityChanged(object sender, NetworkAvailabilityEventArgs e)
    {
        if (e.IsAvailable)
        { 
            //a network is available
        }
    }
}