下载后添加引用 Ajax.dll
功能：在textbox中输入内容，动态从数据库模糊查询显示到下拉框中，以供选择
1.建立一aspx页面，html代码
<%@ Page Language="C#" AutoEventWireup="true" Codebehind="WebForm1.aspx.cs" Inherits="Web.WebForm1" %>
<HTML>
<HEAD>
<title>WebForm1</title>
<SCRIPT language="javascript">
//城市------------------------------
function cityResult()
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2后台代码
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;
using System.Web.Services;
using OG.DBUtility;
namespace Web
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3.源代码下载
4.数据库脚本
CREATE TABLE [dbo].[city](
[id] [int] NOT NULL,
[cityID] [nvarchar](6) COLLATE Chinese_PRC_CI_AS NULL,
[city] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NULL,
[father] [nvarchar](6) COLLATE Chinese_PRC_CI_AS NULL,
CONSTRAINT [PK_city] PRIMARY KEY CLUSTERED
(
[id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
5：添加配置文件
<httpHandlers>
<add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax"/>
</httpHandlers>