private void Admin_Window_Click(object sender, RoutedEventArgs e)
 {
     Admin_Window main = new Admin_Window();
     main.Show();
     //this.Close();
 }
 private void previouswindowButton_Click(object sender, RoutedEventArgs e)
 {
     Admin_Window main = new Admin_Window();
     main.Show();
     this.Close();
 }