Register a dll(service) on web server

[tagg3rx]

Hello,
I have a need to create a set of scripts that will send a weekly e-mail out with some info i pull from my sql servers. Currently to accomplish this I have written an aspx page that sends out the e-mail and i have written a vb script that loads the page waits 5 minutes and then closes it, and i am calling that vb script using windows scheduler.

I consider this solution to be a "Hack" and i wanted to simply write a C# file and compile it to a dll with logic that says something like "on wed at 12:00 am do routines"

But I don't know how to go about registering the dll as a service, making it a persistent service that will always start when the server does and also once it is registered can i simply write a code that says if(DateTime.now == {date}) or do i need to have it looping constantly in the code. If the latter how do i keep from crippling the server?

Thanks.