Message-Box refreshing issue

I have used many message boxes in my current application but in some places where i used list box,list there when i move messagebox then the back screen is looks like everything is removing or cleaning nothing just refreshing issue, then i look and sort out by sinety testing like i used listView.BeginUpdate(); before dialog box check when i used after it then it works fine. because this method is used to update listview without any flicker and refreshing but i used before dialog check thats why i was facing that problem.

Happy to code...