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    <p>One way to do it, if you do not need to do it on a scheduled time, but just needs to clean up "once in a while", is to create a function in your Global.asax Session_OnEnd() that will create a random number between 1 and 100, and if the number is say, 50, you execute the maintenance task.</p> <p>Offcourse you can reduce the "100" to have the task happen more frequently.</p> <p>Also there is and article titled 'Simulate a Windows Service using ASP.NET to run scheduled jobs' at <a href="http://www.codeproject.com/aspnet/ASPNETService.asp" rel="nofollow noreferrer">http://www.codeproject.com/aspnet/ASPNETService.asp</a> that uses an expiring cache to simulate a timer. It claims it can be run on any hosted site.</p> <p>If you are using the last one, please read this comment from a post about this technique:</p> <blockquote> <p>You need to really be careful on the length of the task running. Every new Task is a new Worker Thread and there’s a limited number of those - as it “borrows” a thread from the managed thread pool.</p> <p>Starting in v3.5 of the Framework the maximum number of threads was increased 10x from 25 to 250. But there’s now a logarithmic startup to them, so as it doles out more threads it gets stingier with them. If you run out of available threads in the managed thread pool - your response times are going to go through the roof.</p> <p>What you’re really writing here is a messaging/queuing system.</p> <p>If you’re doing things like updating the cache, then by all means - kick off a new task. If you’re doing something like downloading a secondary HTTP resource or some kind of intensive database work - write a Windows Service and use a Queue that allows you more control over how much you “bite” off each time.</p> </blockquote>
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