private void bkgndWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
pro?.Close();
pro.Dispose();
pro = null;
MessageBox.Show(e.Result.ToString());
}
public void runAsync(Func<String> act) {
pro = new FrmProgress();
bkgndWorker.RunWorkerAsync(act);
pro.ShowDialog();
}