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Windows scheduler12/21/2023 ThreadStart tsTask = new ThreadStart(TaskLoop) When Windows service starts, creates and starts separate thread Here is an example of Windows service that uses new thread to make periodic calls class method (scheduled task): Instead of using Application_Start in Global.asax, in Windows service we'll use OnStart method to initially create loop with Timer or Thread, and start scheduled task. These ideas are useful for Windows service approach too. In Scheduled Tasks in ASP.NET tutorial, there are two examples that use Timer.Elapsed and Thread.Sleep to create a task loop. Implementation code is almost the same for both win services and ASP.NET methods. in night hours), web server will force ASP.NET application to shutdown and your scheduled tasks will not run until someon visits website. Also, if in some period there is no visitors on your site (e.g. That could be changing of web.config file, change in /bin folder, change of Global.asax file, change in App_Global_Resources or App_Local_Resources folders, change in App_Code folder etc. There are many different reasons that cause ASP.NET application to restart. If ASP.NET application doesn't work because process is recycled by server, any scheduled task also doesn't execute. Windows services are more reliable for scheduled tasks than pure ASP.NET because ASP.NET application could stop or restart in many cases. ' Add code here to perform any tear-down necessary to stop your service. ' in motion so your service can do its work. Protected Overrides Sub OnStart( ByVal args() As String) Protected override void OnStart( string args) Public partial class Service1 : ServiceBase Service code includes class constructor, OnStart and OnStop methods: Under Windows section, Visual Studio contains template for Windows Service project, which automatically creates basic structure for new Windows service. On shared hosting, users usually can't install Windows services, but you can run Windows service on another computer that will call web page or web service on web server. If you have dedicated hosting, you can install Windows service on server that will execute scheduled tasks. When this happens, scheduled task could delay execution or not execute at all.īecause of this, for time critical tasks that must be executed in specified time, developers usually choose more reliable, external solution like using of custom Windows service or Windows Task scheduler. Problem with ASP.NET only methods is that ASP.NET application could restart or even stop work because of numerous reasons. To learn how to simulate scheduled tasks using ASP.NET only, see Scheduled Tasks in ASP.NET tutorial. This could be only option if you are on shared hosting. Using pure ASP.NET, you can simulate scheduled tasks and this could work well in simple cases. ASP.NET has not straightforward and reliable solution for tasks like these. That could be creating of some reports every day, sending a reminder e-mail, keep website alive by calling dummy page every 10 minutes, backup data etc. There are scenarios when ASP.NET web application needs to execute some code on regular basis. Using Task Scheduler or Windows Service For Scheduled Tasks
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