If get this from the Microsoft official documentation:
The Application_Start and Application_End methods are special methods that do not represent HttpApplication events. ASP.NET calls them once for the lifetime of the application domain, not for each HttpApplication instance.
I was sure that Application_Start was related to the HttpApplication, here this guy explains why I was wrong.
Which object/entity is related to the Application_Start event?
Answers:
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Method 1
As the documentation says, the events are linked to the lifetime of the application domain, which in practice means the app pool which the application is running in. Application_Start will fire again if the app pool is recycled for any reason – a change to web.config, for example.
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