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I have a form that spawns a BackgroundWorker, that should update form's own textbox (on main thread), hence Invoke((Action) (...)); call. If in HandleClosingEvent I just do bgWorker.CancelAsync() then I get ObjectDisposedException on Invoke(...) call, understandably. But if I sit in HandleClosingEvent and wait for bgWorker to be done, than .Invoke(...) never returns, also understandably. Any ideas how do I close this app without getting the exception, or the deadlock? Following are 3 relevant methods of the simple Form1 class: public Form1() { InitializeComponent(); Closing += HandleClosingEvent; this.bgWorker.RunWorkerAsync(); } private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { while (!this.bgWorker.CancellationPending) { Invoke((Action) (() => { this.textBox1.Text = Environment.TickCount.ToString(); })); } } private void HandleClosingEvent(object sender, CancelEventArgs e) { this.bgWorker.CancelAsync(); /////// while (this.bgWorker.CancellationPending) {} // deadlock }

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