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copied!<p>The label is not updating because the main UI thread is busy doing other things. </p> <p>Looking to your code, it seems that you are running the AVI file conversion business inside your main UI thread. You should run this time consuming task in a separate thread to make sure your UI stays responsive. </p> <p>Below is a fix to your problem, replace your <code>foreach (String file in listToRemove){}</code> by:</p> <pre><code>Action aviConversion = new Action(() => { if(listToRemove.Count == 0) return; // nothing to do lblStatus2.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal, new Action(() => { lblStatus2.Content = "Convert file to .AVI...";}); ); foreach (String file in listToRemove){ FileInfo fileInfo = new FileInfo(file); editpcap = new (classes who convert the files)(fileInfo); String newFileName = editpcap._newFileName; Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal, new Action(() => { listBoxFiles.Items.Add(newFileName); })); } lblStatus2.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal, new Action(() => { lblStatus2.Content = "AVI file conversion finished...";}); }); // Run this action in a separate thread... Task.Factory.StartNew(action, "beta"); </code></pre> <p><strong>EDIT</strong> Using <code>Thread</code> instead of <code>Task</code> (OP can't use <code>Task</code>)</p> <pre><code>private void ProcessAviFiles(){ if(listToRemove.Count == 0) return; // nothing to do lblStatus2.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal, new Action(() => { lblStatus2.Content = "Convert file to .AVI...";}); ); foreach (String file in listToRemove){ FileInfo fileInfo = new FileInfo(file); editpcap = new (classes who convert the files)(fileInfo); String newFileName = editpcap._newFileName; Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal, new Action(() => { listBoxFiles.Items.Add(newFileName); })); } lblStatus2.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal, new Action(() => { lblStatus2.Content = "AVI file conversion finished...";}); } </code></pre> <p>replace your <code>foreach (String file in listToRemove){}</code> by:</p> <pre><code>(new System.Threading.Thread(ProcessAviFiles)).Start(); </code></pre>

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