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    <p>As I understand you want only single background worker launched at time. If so, then try this (based on <a href="http://msdn.microsoft.com/en-us/library/system.threading.autoresetevent.aspx" rel="noreferrer">System.Threading.AutoResetEvent</a>)</p> <pre><code>//introduce additional field private AutoResetEvent _workerCompleted = new AutoResetEvent(false); //modify StartBackgroundFileChecker private void StartBackgroundFileChecker(string file) { ListboxFile listboxFile = new ListboxFile(); listboxFile.OnFileAddEvent += listboxFile_OnFileAddEvent; BackgroundWorker backgroundWorker = new BackgroundWorker(); backgroundWorker.WorkerReportsProgress = true; backgroundWorker.DoWork += (s3, e3) =&gt; { //check my file }; backgroundWorker.RunWorkerCompleted += backgroundWorker_RunWorkerCompleted; backgroundWorker.RunWorkerAsync(); //new code - wait for completion _workerCompleted.WaitOne(); } //add completion notification to backgroundWorker_RunWorkerCompleted void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { if (Interlocked.Decrement(ref numWorkers) == 0) { //update my UI } //new code - notify about completion _workerCompleted.Set(); } </code></pre> <p>In that solution your background thread will start new BackgroundWorker one by one - this can be not optimal (you could avoid BackgroundWorker at all and simply update UI via Dispatch in <em>threadStart</em> delegate)</p> <p>In my opinion better to control number of parallel threads and still process files in multiple but limited numbers of threads.</p> <p>Here is the alternative solution (based on System.Threading.Tasks namespace):</p> <pre><code> private void btnAddDir_Click(object sender, EventArgs e) { var selectedPath = folderBrowserDialog1.SelectedPath; Task.Factory.StartNew(() =&gt; { var files = Directory.EnumerateFiles(selectedPath, "*.*", SearchOption.AllDirectories); Parallel.ForEach(files, new ParallelOptions { MaxDegreeOfParallelism = 10 // limit number of parallel threads here }, file =&gt; { //process file here - launch your process }); }).ContinueWith( t =&gt; { /* when all files processed. Update your UI here */ } ,TaskScheduler.FromCurrentSynchronizationContext() // to ContinueWith (update UI) from UI thread ); } </code></pre> <p>You can tweak this solution for your specific needs.</p> <p>Used classes/methods (see MSDN for reference):</p> <ul> <li><a href="http://msdn.microsoft.com/en-us/library/system.threading.tasks.task.aspx" rel="noreferrer">Task</a></li> <li>TaskScheduler.FromCurrentSynchronizationContext </li> <li>Parallel.ForEach Method (IEnumerable, ParallelOptions, Action)</li> </ul>
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    1. USGustavo Cardoso
    1. USVlad I.
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    1. VO
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      1. VTUpMod
    2. VO
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    1. COI think control number of parallel will be much better
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      1. USuser2214609
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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