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    <p>Well, the design is terrible... but <em>if</em> you <em>need</em> to stick to it, you can set wait handles in a previous worker and wait for it in next. This is the minimal fix, still quite an abomination:</p> <pre><code>public void Start(object obj) { try { BackgroundWorker previousWorker = null; DataHolderClass previousWorkerParams = null; foreach (KeyValuePair&lt;string, Stream&gt; pair in this.CollectionOfFiles) { // signal event on previous worker RunWorkerCompleted event AutoResetEvent waitUntilCompleted = null; if (previousWorker != null) { waitUntilCompleted = new AutoResetEvent(false); previousWorker.RunWorkerCompleted += (o, e) =&gt; waitUntilCompleted.Set(); // start the previous worker previousWorker.RunWorkerAsync(previousWorkerParams); } Worker = new BackgroundWorker(); Worker.DoWork += (o, e) =&gt; { // wait for the handle, if there is anything to wait for if (waitUntilCompleted != null) { waitUntilCompleted.WaitOne(); waitUntilCompleted.Dispose(); } worker_DoWork(o, e); }; using (Stream stream = pair.Value) { primaryDocument = new Document(stream); DataHolderClass dataHolder = new DataHolderClass(); dataHolder.FileName = pair.Key; dataHolder.Doc = secondaryDocument; // defer running this worker; we don't want it to finish // before adding additional completed handler previousWorkerParams = dataHolder; } previousWorker = Worker; } if (previousWorker != null) { previousWorker.RunWorkerAsync(previousWorkerParams); } } catch (Exception ex) { // exception logic } finally { // complete logic } } </code></pre>
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    1. POPausing a new BackGroundWorker until previous completes
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