private void btnQuayLai_Click(object sender, EventArgs e)
{
ThemBCNam bcnam = new ThemBCNam();
this.Hide();
bcnam.Show();
}
private void nămToolStripMenuItem_Click(object sender, EventArgs e)
{
ThemBCNam bcn = new ThemBCNam();
this.Hide();
bcn.Show();
}
private void ChiTietBCNam_FormClosing(object sender, FormClosingEventArgs e)
{
ThemBCNam bcnam = new ThemBCNam();
this.Hide();
bcnam.Show();
}