Thx. I got the reference to System.Windows.Controls.
But now there is a nother problem. I would like to use ListViewItem, but there is ambiguoulty between Forms and Controls references.
Take a look at this picture.
hi actualy am in company ,,,,i cont get ur scren shot,,,thy blocked some thg ......can u plz mail th steps to add ref for system.windows.controls
...i tryed ths (ref-addref ) but thr s no ref like(firstname.lastname@example.org)