private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
 {
     if (storeData)
     {
         TestStorage.WriteXml <ObservableCollection <CustomerName> >(customers, "CustomerTest.xml");
     }
 }
 private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
 {
     if (storeData)
     {
         TestStorage.WriteXml <ObservableCollection <ArticleInfo> >(articleinfo, "ArticleInfo.xml");
     }
     Owner.Visibility = Visibility.Visible;
 }
 private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
 {
     TestStorage.WriteXml <ObservableCollection <ArticleName> >(articles, "StudentsTest.xml");
 }