黑马程序员----手机号码归属地

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Configuration;

namespace ip地址归属地查询
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void comb省_SelectedIndexChanged(object sender, EventArgs e)
        {
            comb市.Items.Clear();
            provinceItems Item = (provinceItems)comb省.SelectedItem;
            int proID = Item.ID;
            string conStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
            using (SqlConnection conn = new SqlConnection(conStr))
            {
                conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
                    cmd.CommandText = "select * from city where proID=@proID";
                    cmd.Parameters.Add(new SqlParameter("proID", proID));
                    using (SqlDataReader datareader = cmd.ExecuteReader())
                    {
                        while (datareader.Read())
                        {
                            string cityName = datareader.GetString(datareader.GetOrdinal("cityName"));
                            comb市.Items.Add(cityName);
                        }
                    }
                }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string conStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
            using (SqlConnection conn = new SqlConnection(conStr))
            {
                conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
                    cmd.CommandText = "select * from promary";
                    using (SqlDataReader datareader = cmd.ExecuteReader())
                    {
                        while (datareader.Read())
                        {
                            provinceItems Item = new provinceItems();
                            Item.ID = datareader.GetInt32(datareader.GetOrdinal("proID"));
                            Item.Name = datareader.GetString(datareader.GetOrdinal("proName"));
                            comb省.Items.Add(Item);
                        }
                    }
                }
            }
        }
        class provinceItems
        {
            public string Name { get;set;}
            public int ID { get; set; }
        }
    }
}