File changes are not the cause of application pool recycling. In addition to the default collection every 29 hours, the other way to allow the application pool to be recycled is to set a specific time or specific request amount or memory usage. It can also be recycled manually.
After the file is changed, the update is applied, not because the application pool is recycled, but the application is reloaded by IIS or ASP.NET, and w3wp.exe is always the same in the task manager.
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