根据省份级联查询城市(WinForm)

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1.添加引用，选择ProvinceCity.dll
2.using ProvinceCity;

        private void Form1_Load(object sender, EventArgs e)
        {
            //绑定省份
            ProvinceCity.ProvinceCity.BindProvince(comboBox1);
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            //绑定城市
            ProvinceCity.ProvinceCity.BindCity(comboBox1, comboBox2);
        }

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