I have been working with a bunch of custom timer jobs for last month. Basically, I'm processing a bunch of SharePoint items from the timer job and since I don't want the job failing because of an error on one item, so I'm handing errors on an item-by-item basis and just continuing on with the next item. The net result of this, I soon found, is that my timer job actually says it ran successfully even if every single item fails. So I figured I would just set the "Failed" status on the timer job is anything went wrong so an administrator could see that not all was well. However, I quickly found that there is no way to set a timer job status. If you want the status to show up as "Failed" then the only way to do it is to throw an exception. In my case, I just used a flag to store whether or not an error had occurred, and if so the the timer job throws a an exception just before existing to let the status display correctly.
