How to make a dialog box modal? [modified]

[TaiZhong]

I call the "GetOpenFileName" (Win32 API function) to creates and Open a dialog box. The dialog box is popped up but it is a modeless dialog. What I want is a modal dialog box. Anyone know how to solve this problem? Thanks. -- modified at 5:35 Wednesday 29th August, 2007 I have to customise the OpenFileDialog so that it support the picture preview in the OpenFileDialog box. So I can't use the normal OpenFileDialog class.

[Bekjong]

Why not use the .net function in stead of the win32 one? You can show it modally like this:

OpenFileDialog ofd = new OpenFileDialog();
ofd.ShowDialog();

Standards are great! Everybody should have one!