private PurgeData data=new PurgeData();

private void MenuPurgeData_Click(object sender, RoutedEventArgs e)
        {

            try
            {
                if (PurgeData == null)
                {
                    PurgeData = new PurgeData();
                    PurgeData.Show();
                }
                else
                {
                    PurgeData.WinLoad();
                    PurgeData.Show();
                }
            }