myframe.aspx.cs

AJAX入门２０例之２

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class myframe : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //获取传递过来的参数
        string city = Request.QueryString["city"];
        //判断城市名
        switch (city)
        {
            case "北京":
                //填充相关的区域
                DropDownList1.Items.Clear();
                DropDownList1.Items.Add("朝阳");
                DropDownList1.Items.Add("海淀");
                DropDownList1.Items.Add("东城");
                DropDownList1.Items.Add("西城");
                break;
            case "上海":
                DropDownList1.Items.Clear();
                DropDownList1.Items.Add("浦东");
                DropDownList1.Items.Add("静安");
                DropDownList1.Items.Add("虹口");
                DropDownList1.Items.Add("徐汇");
                break;
            case "济南":
                DropDownList1.Items.Clear();
                DropDownList1.Items.Add("历下");
                DropDownList1.Items.Add("历城");
                DropDownList1.Items.Add("市中");
                DropDownList1.Items.Add("天桥");
                break;
        }
    }
}