public static DeleteWorker GetDeleteWorker()
{
if (del_worker == null)
{
del_worker = new DeleteWorker();
}
del_worker.Activate();
return(del_worker);
}
private void DeleteWorker_Click(object sender, RoutedEventArgs e)
{
del_worker = DeleteWorker.GetDeleteWorker();
del_worker.Show();
}
private void Window_Closed(object sender, EventArgs e)
{
del_worker = null;
}