private void lbx_tennv_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
NguoiDung nd = new NguoiDung();
nd.ShowDialog();
}
private void ngườiDùngToolStripMenuItem_Click(object sender, EventArgs e)
{
NguoiDung ND = new NguoiDung();
ND.ShowDialog();
}