public void Application_Start(Object sender, EventArgs e)
{
_siteUrl = GetSiteUrl();
// set-up Settings
ClassifiedsHttpApplication.ClassifiedsApplicationSettings = SiteSettings.LoadFromConfiguration();
// set-up maintenance timer
_lastNotificationTime = DateTime.Now;
TimerCallback callback = new TimerCallback(Maintenance.HourlyMaintenanceTimer);
_hourlyTimer = new Timer(callback, null, TimeSpan.Zero, TimeSpan.FromHours(1.0));
}