private void button9_Click(object sender, EventArgs e)
{
if (Add_City_Is_NumberOrNull())
{
return;
}
if (!grp1.City_True(textBox3.Text.ToString()))
{
MessageBox.Show("没有此城市");
return;
}
grp1.Del_City(textBox3.Text.ToString());
MessageBox.Show("城市信息删除完毕");
}