private void thêmXóaPhòngToolStripMenuItem_Click(object sender, EventArgs e)
{
Txphong tx = new Txphong();
tx.ShowDialog();
frm_load();
}
private void thêmNhânViênToolStripMenuItem_Click(object sender, EventArgs e)
{
Txphong t = new Txphong();
t.ShowDialog();
}