private void btKhachHang_Click(object sender, EventArgs e)
{
frmKhachHang kh = new frmKhachHang();
kh.Show();
}
private void customerINFOToolStripMenuItem_Click(object sender, EventArgs e)
{
frmKhachHang kh = new frmKhachHang();
kh.Show();
}