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copied!<p>For situations where one thread needs to 'signal' another thread to do something, I usually use a System.Threading.ManualResetEvent to signal the secondary thread to stop, like this:</p> <pre><code>private volatile bool _threadRunning = false; private ManualResetEvent _signal = new ManualResetEvent(false); private Thread _thread; private void OnButtonClick(object sender, EventArgs e) { if (!_threadRunning) { // Reset the 'signal' event. _signal.Reset(); // Build your thread parameter here. object param = ; // Create the thread. _thread = new Thread(ExecuteThreadLogicConditionally(param)); // Make sure the thread shuts down automatically when UI closes _thread.IsBackground = true; // Start the thread. _thread.Start(); // Prevent another thread from being started. _threadRunning = true; } else { // Signal the thread to stop. _signal.Set(); // DO NOT JOIN THE THREAD HERE! If the thread takes a while // to exit, then your UI will be frozen until it does. Just // set the signal and move on. } } // If the thread is intended to execute its logic over and over until // stopped, use this callback. private void ExecuteThreadLogicUntilStopped(object param) { // Use a while loop to prevent the thread from exiting too early. while (!_signal.WaitOne(0)) { // Put your thread logic here... } // Set the flag so anther thread can be started. _threadRunning = false; } // If the thread logic is to be executed once and then wait to be // shutdown, use this callback. private void ExecuteThreadLogicOnce(object param) { // Put your thread logic here... // // Now wait for signal to stop. _signal.WaitOne(); // Set the flag so another thread can be started. _threadRunning = false; } // If the thread needs to be stopped at any point along the way, use // this callback. The key here is to 'sprinkle' checks of the 'signal' // to see if the thread should stop prematurely. private void ExecuteThreadLogicConditionally(object param) { if (_signal.WaitOne(0)) { _threadRunning = false; return; } // Execute small chunk of logic here... if (_signal.WaitOne(0)) { _threadRunning = false; return; } // Execute another small chuck of logic here... if (_signal.WaitOne(0)) { _threadRunning = false; return; } // Continue this pattern through the method. } </code></pre> <p>Note that this solution does not use the ThreadPool at all. It could easily be made to do so. And as a suggestion, I wouldn't muck with SetMaxThreads() function on the ThreadPool. Just let the ThreadPool do its thing. It's been designed to be optimal for the way you use it.</p>

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