private void QuanLyKho_Click(object sender, RoutedEventArgs e)
{
QLSanPham f = new QLSanPham(TENDN);
f.Show();
this.Close();
}
private void btnQuayLai_Click(object sender, RoutedEventArgs e)
{
QLSanPham sp = new QLSanPham();
sp.Show();
this.Close();
}