private void btnHelp_Click(object sender, EventArgs e)
{
HuongDan HD = new HuongDan();
HD.Show();
}
private void hướngDẫnSửDụngToolStripMenuItem_Click(object sender, EventArgs e)
{
HuongDan HD = new HuongDan();
HD.Show();
}
private void hướngdẫnSửDụngToolStripMenuItem_Click_1(object sender, EventArgs e)
{
HuongDan HuongDan = new HuongDan();
HuongDan.Show();
}