private void btnSanPham_Click(object sender, EventArgs e)
{
frmSanPham dt = new frmSanPham();
dt.Show();
this.Hide();
}
private void quảnLýDinhViênToolStripMenuItem_Click(object sender, EventArgs e)
{
frmSanPham dt = new frmSanPham();
dt.Show();
this.Hide();
}