public Quanlyphong(string id)
{
InitializeComponent();
account = id;
grid_phong.ItemsSource = PhongDAO.LoadAll().DefaultView;
cb_tinhtrang.ItemsSource = TinhTrangDAO.LoadAll().DefaultView;
cb_trangthai.ItemsSource = TrangThaiDAO.LoadAll().DefaultView;
cb_loaiphong.ItemsSource = LoaiPhongDAO.LoadAll().DefaultView;
}