Thanks very much, now I at least was able to create a .dll file. Anyways the scheduler does not seem to work:

I created the following DoWork() method for testing purpose:

public override void DoWork()
        {
            try
            {
               
                this.Progressing();
                ScheduleHistoryItem.AddLogNote("Start work... ");
                System.Threading.Thread.Sleep(5000);
                ScheduleHistoryItem.Succeeded = true;
                ScheduleHistoryItem.AddLogNote("Worked.");
            }
            catch (Exception exc)
            {
                ScheduleHistoryItem.Succeeded = false;
                ScheduleHistoryItem.AddLogNote("EXCEPTION: " + exc.ToString());
                Errored(ref exc);
                Exceptions.LogException(exc);
            }
        }

In my DNN bin folder I find the myCompany.modules.myScheduler.dll file. I go to Host > Scheduler and add a new scheduler definition pointing to myCompany.modules.myScheduler.components.MyScheduledTaskClassName (I also tried without components and withouth the class name). Anyways, in the scheduler history I cannot find any log entries.