private void buttonapr_Click(object sender, EventArgs e) { if (_queueT == null) { _queueT = new QueueTask(bcr, ListScanOperation.TaskPGA); _queueT.Show(); } else { if (_queueT.FormActive) { } else { _queueT.Close(); // UIEU.Dispose(); _queueT = new QueueTask(bcr, ListScanOperation.TaskPGA); _queueT.Show(); } } }