Advantage of using Thread.Start vs QueueUserWorkItem

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The ThreadPool is always there, however, there are a finite number of threads allocated to the pool based on the number of processors. For ASP.NET applications, it is generally a bad idea to use Threads unless you really are starting off an Async process and know that there won’t be a large number of requests (remember that there are a finite number of threads in the ThreadPool which you share with everything running in your AppDomain and there is a realistic limit on the total number of threads you want to create using new Thread() as well).

For WinForms apps consider using the BackgroundWorker instead of using a Thread or the ThreadPool. It uses the ThreadPool, however, it makes communicating between threads easier on the multi-thread savvy programmer.

Updated

Avoid using ThreadPool.QueueUserWorkItem as your app pool could disappear at any time. Move this work outside or use WebBackgrounder if you must.

From Hanselman.com – “Checklist: What NOT to do in ASP.NET”

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