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copied!<p>using a <code>System.Threading.Monitor</code> class will do the trick like:</p> <pre><code>private readonly object _userActivityLocker = new object(); private void btnSave_Click(object sender, EventArgs e) { new Thread(delegate() { if (System.Threading.Monitor.TryEnter(_userActivityLocker)) { //note that any sub clicks will be ignored while we are here try { //here it is safe to call the save and you can disable the btn } finally { System.Threading.Monitor.Exit(_userActivityLocker); //re-enable the btn if you disable it. } } }) { IsBackground = true }.Start(); } </code></pre> <p>To prove that changing the button to enable or disable state is not enough here a simple test:</p> <p>Add a new form and add a button1 to it and inside the button1 click event handler write the following code:</p> <pre><code>private void button1_Click(object sender, EventArgs e) { button1.Enabled = false; Console.WriteLine("First Message"); Thread.Sleep(2000); Console.WriteLine("second Message"); button1.Enabled = true; } </code></pre> <p>and then build and run the application, double click on the button1 and the result int the output window will be:</p> <pre><code>First Message second Message First Message second Message </code></pre> <p>so we have to make sure only one click is executed even when double click or so and that accomplished simply by using the <code>System.Threading.Monitor</code></p> <p><strong>Update:</strong> Note that you can use a Task "if C# 4.0", a ThreadPool.QueueUserWorkItem or BackgroundWorker as a substitute of Thread.</p>

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