//ToolStrip Icon Thông Tin.
private void tsbthongtin_Click(object sender, EventArgs e)
{
ThongTin info = new ThongTin();
info.Show();
}
//MenuStrip Thông Tin
private void menustrip_thongtin_Click(object sender, EventArgs e)
{
ThongTin thongtin = new ThongTin();
thongtin.Show();
}