If you want to schedule ASP.NET tasks, one solution is to use a Web service to provide an interface to your ASP.NET application and build a Windows service that calls to it at scheduled intervals. Thus the ASP.NET application doesn't have to own the scheduling logic. Here the author shows how to schedule your ASP.NET tasks using a Windows service to initiate the Web service call because Windows services can start themselves when Windows boots up.
MSDN Magazine March 2005
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