private void btn_Add_Click(object sender, EventArgs e)
{
Form f = new Agency_edit(myBL);
f.ShowDialog();
agencyIDListBoxRefresh();
}
private void btn_Edit_Click(object sender, EventArgs e)
{
Form f = new Agency_edit(myBL, (Tour_Agency)agencyIDListBox.SelectedItem);
f.ShowDialog();
agencyIDListBoxRefresh();
}