public class NotificationManager 

//Create notification
 Dynamicweb.Extensibility.NotificationManager.Notify("MY_NOTIFICATION", new string[] { "my notification" });
 ...
 //How to subscribe to notification
 [Dynamicweb.Extensibility.Subscribe("MY_NOTIFICATION")]
    public class MyObserver : Dynamicweb.Extensibility.NotificationSubscriber
    {
        public override void OnNotify(string notification, object[] args)
        {
            if (args == null || args.Length != 1)
                return;
 
            string message = (string)args[0];
 
            Dynamicweb.Base.WriteEventLog(message, System.Diagnostics.EventLogEntryType.Information);
        }
    }