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    <p>You need to either use <code>BackgroundWorker</code>, or <code>Control</code>.<code>Invoke</code>/<code>BeginInvoke</code>. Anonymous functions - either anonymous methods (C# 2.0) or lambda expressions (C# 3.0) make this easier than it was before.</p> <p>In your case, you can change your code to:</p> <pre><code>public bool AddUser(string user, RichTextBox textBox1, List listBox1) { MethodInvoker action = delegate { textBox1.Text += "Connected to server... \n"; }; textBox1.BeginInvoke(action); } </code></pre> <p>A few things to note:</p> <ul> <li>To conform with .NET conventions, this should be called <code>AddUser</code></li> <li>You don't need to pass the textbox or listbox by reference. I suspect you don't quite understand what <code>ref</code> really means - see <a href="http://pobox.com/~skeet/csharp/parameters.html" rel="noreferrer">my article on parameter passing</a> for more details.</li> <li>The difference between <code>Invoke</code> and <code>BeginInvoke</code> is that <code>BeginInvoke</code> won't wait for the delegate to be called on the UI thread before it continues - so <code>AddUser</code> may return before the textbox has <em>actually</em> been updated. If you don't want that asynchronous behaviour, use <code>Invoke</code>.</li> <li>In many samples (including some of mine!) you'll find people using <code>Control.InvokeRequired</code> to see whether they need to call <code>Invoke</code>/<code>BeginInvoke</code>. This is actually overkill in most cases - there's no real <em>harm</em> in calling <code>Invoke</code>/<code>BeginInvoke</code> even if you don't need to, and often the handler will <em>only</em> ever be called from a non-UI thread anyway. Omitting the check makes the code simpler.</li> <li>You can also use <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx" rel="noreferrer"><code>BackgroundWorker</code></a> as I mentioned before; this is particularly suited to progress bars etc, but in this case it's probably just as easy to keep your current model.</li> </ul> <p>For more information on this and other threading topics, see <a href="http://pobox.com/~skeet/csharp/threads" rel="noreferrer">my threading tutorial</a> or <a href="http://www.albahari.com/threading/" rel="noreferrer">Joe Albahari's one</a>.</p>
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