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copied!<p>This looks like it should work, maybe it has some thing to do with concurrency.<br> Try using <code>comBox.Invoke(...)</code> instead of <code>comBox.BeginInvoke(...)</code><br> <strong>Update:</strong> <strike>The thing is when you use <code>BeginInvoke</code> the method calls may be invoked out of order.</strike><br> That was wrong, calls to <code>Invoke</code> and <code>BeginInvoke</code> are executed in order. </p> <p><strong>Edit:</strong><br> It that doesn´t work make sure you don´t have any other place where you change the text in <code>comBox</code>. </p> <p>If it still doesn´t work you might have to create a lock to make sure you don´t have two thread simultaneously writing to the textbox.</p> <p>Something like this:</p> <pre><code>private static readonly object _comBoxSyncObj = new object(); public void LogComText(string comText, bool newline) { if (comBox.InvokeRequired) { comBox.Invoke(new Action(delegate { LogComText(comText, newline); })); return; } lock (_comBoxSyncObj) { comBox.AppendText(comText); if(newline) comBox.AppendText(Environment.NewLine); } } </code></pre> <p><strong>Edit2:</strong><br> If the problem persists, you can add an event handler for the <code>TextChanged</code> event and put a breakpoint in it to se when the textbox get cleared. </p> <p>Add this method and an eventhandler for <code>TextChanged</code> on comBox:</p> <pre><code>private void comBox_TextChanged(object sender, EventArgs e) { if (comBox.TextLength == 0) { // Set a breakpoint here. Trace.WriteLine("TextBox empty"); } } </code></pre>

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