Scheduled Task using HttpRuntime.Cache

Question

Hi, I saw an article on here explaining a simple way of repeating a block of code using the runtime cache (http://blog.stackoverflow.com/2008/07/easy-background-tasks-in-aspnet/). I'm using this method to run a feed system so if a new feed is uploaded it will run the next time this code fires. See code below:

public delegate void FeedDelegate();

private static CacheItemRemovedCallback OnCacheRemove = null;

void Application_Start(object sender, EventArgs e) {

    AddTask("FeedScheduler", 60);

}

private void AddTask(string name, int seconds) {

    OnCacheRemove = new CacheItemRemovedCallback(CacheItemRemoved);

    HttpRuntime.Cache.Insert(name, seconds, null, DateTime.Now.AddSeconds(seconds), Cache.NoSlidingExpiration, CacheItemPriority.NotRemovable, OnCacheRemove);

}

public void CacheItemRemoved(string k, object v, CacheItemRemovedReason r) {        

    FeedDelegate d = new FeedDelegate(runFeed); 

    d.BeginInvoke(null, null);        


    AddTask(k, Convert.ToInt32(v));

}

void runFeed(){

    Feeds.run();

}

I'm finding that after a while the code stops running and I can't figure out why. I've set the application pool not to timeout.

Any ideas?