register.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
using ClassLibrary2;
using System.Collections;

public partial class register : System.Web.UI.Page
{
    string str = System.Configuration.ConfigurationManager.AppSettings["str_con"].ToString(); //连接数据库
    SqlConnection conn = null;
    SqlCommand cmd = null;
    protected void Page_Load(object sender, EventArgs e)
    {
        DropDownList1.SelectedIndexChanged += DropDownList1_SelectedIndexChanged;
        DropDownList2.SelectedIndexChanged += DropDownList2_SelectedIndexChanged;
        if (IsPostBack == false)
        {
            
            List<Chinast> sheng = new ChinastData().selectAll("0001");
            DropDownList1.DataSource = sheng;
            DropDownList1.DataTextField = "Aname";
            DropDownList1.DataValueField = "Acode";
            DropDownList1.DataBind();


            List<Chinast> shi = new ChinastData().selectAll(DropDownList1.SelectedItem.Value);
            DropDownList2.DataSource = shi;
            DropDownList2.DataTextField = "Aname";
            DropDownList2.DataValueField = "Acode";
            DropDownList2.DataBind();

            List<Chinast> qu = new ChinastData().selectAll(DropDownList2.SelectedItem.Value);
            DropDownList3.DataSource = qu;
            DropDownList3.DataTextField = "Aname";
            DropDownList3.DataValueField = "Acode";
            DropDownList3.DataBind();

        }
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        List<Chinast> shi = new ChinastData().selectAll(DropDownList1.SelectedItem.Value);
        DropDownList2.DataSource = shi;
        DropDownList2.DataTextField = "Aname";
        DropDownList2.DataValueField = "Acode";
        DropDownList2.DataBind();

        List<Chinast> qu = new ChinastData().selectAll(DropDownList2.SelectedItem.Value);
        DropDownList3.DataSource = qu;
        DropDownList3.DataTextField = "Aname";
        DropDownList3.DataValueField = "Acode";
        DropDownList3.DataBind();
    }
    protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
    {