I wanna create a notification system on my website?(something like stack-overflow)
How can we schedule a task for mailing the notification for users on each 24 hours?
You can use ATrigger scheduling service. A .Net library is also available to create scheduled tasks without overhead. Errors log, Analytics, Tasks Listings and more benefits.
Disclaimer: I was among the ATrigger team. It's a freeware and I have not any commercial purpose.