private void btnDanToc_Click(object sender, EventArgs e)
{
frmDanToc frm = new frmDanToc();
frm.Show();
this.Hide();
}
private void quảnLýDânTộcToolStripMenuItem_Click(object sender, EventArgs e)
{
frmDanToc frm = new frmDanToc();
frm.Show();
this.Hide();
}