private void bánVéToolStripMenuItem_Click(object sender, EventArgs e)
{
BanVeChuyenBay f = new BanVeChuyenBay();
f.Show();
}
private void btnbanve_Click(object sender, EventArgs e)
{
BanVeChuyenBay f = new BanVeChuyenBay();
f.Show();
}