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Editorial Team
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Asked: 2026-05-13T08:34:44+00:00

I was working on a project and there is bulk e-mail sending part of

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I was working on a project and there is bulk e-mail sending part of it and when user clicks on the button, he/she gets the “Thanks the e-mails have been sent” immediately as a Response and the same method is firing an async thread as well.

ThreadPool.QueueUserWorkItem(SendEMail, _message);

This thread is queued when user clicks on the send button but since this is default Background Thread I was expecting when the page response ended, this thread would be terminated but it didn’t happen because the current thread which fires this Thread was also a Background Thread and a Worker Thread, so which means there is an unfinished foreground thread(s) (Could be MainThread or Worker Threads) still alive but I don’t know when they finish because their finish time will effect my background worker threads; When the last foreground thread ends, it causes the process to be terminated, so do background threads.

Should I be afraid of this or Asp.NET can handle it automatically and I am kinda confused because I’ve read a lot of things about it and now everything is mixed up.

Could you please clarify things a little bit ?

Thanks in advance.

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1 Answer

  1. Editorial Team

    Using the ThreadPool for long-running tasks will negatively influence the performance of your application (because ASP.NET also uses the ThreadPool to handle incoming requests).

    Creating threads manually for each task can also become a problem if too much threads are created.

    One technique I’ve used in the past, is to create a custom ThreadPool when starting the application, and enqueuing tasks on that ThreadPool. A simple custom ThreadPool could consist of a single Thread and a Queue of tasks.

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