Possible Duplicate:
executing a c# function after each 24 hours
How can job be set to automatically be done at night 12 by asp.net or c#
Possible Duplicate:
executing a c# function after each 24 hours
How can job be set to automatically be done at night 12 by asp.net or c#
ASP .NET isn't really a job scheduler and shouldn't be used as one. It's a web-based request/response system and generally only does things when actively requested to do so by some client.
What you're looking to do, depending on the details of the task(s), can be done with: