SystemEvents.SessionSwitch EVENTS are not getting triggered

See more:

C#

Windows

Win7

Hi,
I have created a service which calls a method called RUN() which is inside another class library project in which i have written code,in such a way that whenever a lock or unlock or logon event occurs it should store the time of occurence of that event inside a notepad.But the events are not getting triggered at all.But when i have written the same code inside the service itself rather than calling events from a class library events are getting triggered .
could anybody explain me why is it happening like that when i have written the same events code in service its working fine but if i write that code in different class library and call the method inside service the events are not triggering.
i have searched vigourously in google but iam not able to find any solution for it.

please find below the code i have written in c# class library and calling the run() method on onstart() of the service.

<pre lang="c#">
  public void run()
        {
            SystemEvents.SessionSwitch += new SessionSwitchEventHandler(SysEventsCheck);            
         
        }
 public void SysEventsCheck(object sender, SessionSwitchEventArgs e)
        {
            switch (e.Reason)
            {
                case SessionSwitchReason.SessionLock:
                    // Console.WriteLine("sessionlock" + " " +DateTime.Now);
                    Note("sessionlock");
                    break;
                case SessionSwitchReason.SessionUnlock:
                    //Console.WriteLine("sessionUnlock" + " " + DateTime.Now);
                    Note("sessionUnlock");
                    break;

                case SessionSwitchReason.SessionLogoff:
                    Note("Logoff");
                    break;

                case SessionSwitchReason.SessionLogon:
                    Note("Logon");
                    break;          

            }
        }
         public void Note(string s)
        {
            try
            {

                string fileloc = Path.Combine(@"C:\", "ORCAError");
                if (!Directory.Exists(fileloc))
                {
                    Directory.CreateDirectory(fileloc);
                }
                string filepath = Path.Combine(fileloc, "TestEvents.txt");
                using (StreamWriter sw = new StreamWriter(filepath, true))
                {
                    sw.WriteLine(s + " at {0}" + "   " + DateTime.Now.ToString());
                }


            }
            catch { }
        }

below is the code i have written in service to call the run() method in class library

public partial class DesktopLogMonitorPro : ServiceBase
{
    public DesktopLogMonitorPro()
    {
        InitializeComponent();
    }

    protected override void OnStart(string[] args)
    {

        Class1 c = new Class1();
            c.Run();
            while (true)
            {
            }
    }


}