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    <p>I recommend using the <code>Task</code> class (added in .NET 4.0) if you need this kind of behaviour. It supports <em>cancellation</em>, and you can have any number of tasks listening to the same cancellation token, which enables you to cancel them all with a single method call.</p> <p><strong>Updated (non-4.0 solution):</strong></p> <p>You really only have two choices. One: implement your own event demultiplexer (this is far more complex than it appears, due to the 64-handle wait limitation); I can't recommend this - I had to do it once (in unmanaged code), and it was hideous.</p> <p>That leaves the second choice: Have a signal to cancel the tasks. Naturally, <code>RegisteredWaitHandle.Unregister</code> can cancel the RWFSO part. The QUWI is more complex, but can be done by making the action aware of a "token" value. When the action executes, it first checks the token value against its stored token value; if they are different, then it shouldn't do anything.</p> <p>One major thing to consider is race conditions. Just keep in mind that there is a race condition between cancelling an action and the ThreadPool executing it, so it is possible to see actions running after cancellation.</p> <p>I have <a href="http://nitoprograms.blogspot.com/2009/04/asynchronous-callback-contexts.html" rel="nofollow noreferrer">a blog post on this concept</a>, which I call "asynchronous callback contexts". The <code>CallbackContext</code> type mentioned in the blog post is available in the <a href="http://nitoasync.codeplex.com/" rel="nofollow noreferrer">Nito.Async</a> library.</p>
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    1. POHow to Purge a ThreadPool? [Microsoft System.Threading.ThreadPool]
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    1. USStephen Cleary
    1. USStephen Cleary
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    1. POHow to Purge a ThreadPool? [Microsoft System.Threading.ThreadPool]
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    1. COExcellent advice.
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      1. USSteven Sudit
    2. CO+1, but Management does not want .NET 4.0 implemented in our infrastructure at this time.
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      1. USjp2code
    3. CO@jp2code: That is too bad; .NET 4.0 brings huge, useful changes to multithreading in .NET. See my updated answer for a pre-.NET 4.0 solution.
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