How to make a Timely event in ASP .Net?

[Gulfam Ali]

Hello,How can I make a timely event in ASP .Net. I mean an event which should get fire at midnight 12:00 and also an event which can check some changes after firing itself after (let say) 20 Minutes. 2nd thing can be achieved using threading (and then thread sleep) but for this we must have a event which must reside in memory permanently. Application_Start is an event where we can write this. But as last client will be closed Application_End will get fired and will stop excution of Application_Start. Is there any way that Application_Start will stay in memory for ever? Finally i will be having dedicated Server. But currently me testing it at a Shared Server..Thanks in AdvanceRegards,