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copied!<p>You don't need to use a lock here at all as the <code>btn_Click</code> method will only be called by the UI thread (unless you explicitly call it from another thread which would be bad).</p> <p>So the code only needs a <code>null</code> check to ensure you only have one worker thread created.</p> <pre><code>public class MainForm : Form { private Thread workerThread = null; public MainForm() { } public void btn_Click() { if (workerThread == null) { var worker = new MyWorker(); worker.StartEvent += (s, e) => { //Invoke some delegate to interact with the window }; workerThread = new Thread(worker.DoWork); workerThread.Start(); } } } </code></pre> <hr> <p>EDIT: In response to a comment from the OP.</p> <pre><code>public class MainForm : Form { private Thread workerThread = null; public MainForm() { } public void btn_Click() { if (workerThread == null || workerThread.IsAlive == false) { var worker = new MyWorker(); worker.StartEvent += (s, e) => { //Invoke some delegate to interact with the window }; worker.EndEvent += (s, e) => { //Clean up }; workerThread = new Thread(worker.DoWork); workerThread.Start(); } } } </code></pre> <p>And <code>MyWorker</code> now looks like this:</p> <pre><code>public class MyWorker { public event EventHandler StartEvent; public event EventHandler EndEvent; public void OnStart() { var se = this.StartEvent; if (se != null) { se(this, new EventArgs()); } } public void OnEnd() { var ee = this.EndEvent; if (ee != null) { ee(this, new EventArgs()); } } public void DoWork() { this.OnStart(); // do some work this.OnEnd(); } } </code></pre>

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