protected void Page_Load(object sender, EventArgs e) { wws.WeatherWebService ws = new wws.WeatherWebService(); string[] reg = ws.getSupportProvince(); for (int i = 0; i < reg.Length; i++) { ddl1.Items.Add(reg[i].Substring(0, reg[i].IndexOf(','))); } string c = ddl1.SelectedItem.Text; string[] city = ws.getSupportCity(c); ddl2.Items.Clear(); for (int i = 0; i < city.Length; i++) { ddl2.Items.Add(city[i].Substring(0, city[i].IndexOf(','))); } Session["addr"] = c + ddl2.SelectedItem.Text; }