C# Timer vs Thread in Service

Question

I have a Service that hits a database every 10 sec and gets the data if there is any. The thing is that processing this data can take up to 30 sec. If I use a Timer with 10 sec

Answer 1

Thread.Sleep is not bad in itself in a service, just that you need to be responsive to service commands, so your worker thread should not go to sleep for an hour, but rather needs to sleep for short periods of time and then wake up and listen if the service controller part of the service is telling it to stop for some reason.

You want to make it so that if the admin tells your service to stop, it'll stop quickly enough so that it won't get any timeout messages where the admin can't be sure that your service is stopped and it's safe to reboot the machine or similar.