SampleApp.MainForm.MainForm_Closing C# (CSharp) Method

        private void MainForm_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            // check if worker thread is running
            if ((workerThread != null) && (workerThread.IsAlive))
            {
                needToStop = true;
                while (!workerThread.Join(100))
                    Application.DoEvents();
            }
        }