private void btnThongtinPM_ItemClick(object sender, ItemClickEventArgs e)
 {
     frmThongtinphanmem thongtin = new frmThongtinphanmem();
     thongtin.Show();
 }
        private void btnThongtinPM_ItemClick(object sender, ItemClickEventArgs e)
        {
            frmThongtinphanmem thongtin = new frmThongtinphanmem();

            thongtin.Show();
        }