省市鏈表

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
          

            string sql = "server=XUXINGSHI-PC\\SQLEXPRESS;database=SS;integrated security=sspi";
            DataSet dt = new DataSet();
            using (SqlConnection sqlcnn = new SqlConnection())
            {
                sqlcnn.ConnectionString = sql;
                SqlCommand sqlcmm = sqlcnn.CreateCommand();
                sqlcmm.CommandText = "select proid,proname from t_province";
                SqlDataAdapter da = new SqlDataAdapter(sqlcmm);
                da.Fill(dt);
            }
            this.RadioButtonList1.DataSource = dt.Tables[0];
            this.RadioButtonList1.DataTextField = "proname";
            this.RadioButtonList1.DataValueField = "proid";

           
            this.CheckBoxList1.DataSource = dt.Tables[0];
            this.CheckBoxList1.DataTextField = "proname";
            this.CheckBoxList1.DataValueField = "proid";

            this.Dropdownlist1.Items.Clear();
            this.Dropdownlist1.DataSource = dt.Tables[0];
            this.Dropdownlist1.DataTextField = "proname";
            this.Dropdownlist1.DataValueField = "proID";
            this.DataBind();

 

            using (SqlConnection sqlcnn = new SqlConnection())
            {
                sqlcnn.ConnectionString = sql;
                SqlCommand sqlcmm = sqlcnn.CreateCommand();
                sqlcmm.CommandText = "select cityID,cityname from t_city where proID=" + this.Dropdownlist1.SelectedValue;
                SqlDataAdapter da = new SqlDataAdapter(sqlcmm);
                da.Fill(dt);
            }
            this.Dropdownlist2.Items.Clear();
            this.Dropdownlist2.DataSource = dt.Tables[0];
            this.Dropdownlist2.DataTextField = "cityname";
            this.Dropdownlist2.DataValueField = "cityID";
            this.DataBind();
        }

    }
    protected void Dropdownlist1_SelectedIndexChanged(object sender, EventArgs e)
    {
        string sql = "server=XUXINGSHI-PC\\SQLEXPRESS;database=SS;integrated security=sspi";
        DataSet dt = new DataSet();
        using (SqlConnection sqlcnn = new SqlConnection())
        {
            sqlcnn.ConnectionString = sql;
            SqlCommand sqlcmm = sqlcnn.CreateCommand();
            sqlcmm.CommandText = "select cityID,cityname from t_city where proID=" + this.Dropdownlist1.SelectedValue;
            SqlDataAdapter da = new SqlDataAdapter(sqlcmm);
            da.Fill(dt);
        }
        this.Dropdownlist2.Items.Clear();
        this.Dropdownlist2.DataSource = dt.Tables[0];
        this.Dropdownlist2.DataTextField = "cityname";
        this.Dropdownlist2.DataValueField = "cityID";
        this.DataBind();
    }
    protected string title;

    //protected string Title1
    //{
    //    get { return title; }
    //    set { title = value; }
    //}

    protected void Button1_Click(object sender, EventArgs e)
    {
        title = Convert.ToString(this.RadioButtonList1.SelectedItem.Text);
        this.DataBind();
           

    }
}