仿百度智能提示

今天做了一下午终于把这个效果（仿百度智能提示功能）做好了，由于偶才接触AJAX技术，所以做这个还是花费了一些时间，不收获还是可以，厚积薄发。。。。不说多了  先看一下代码  呵呵

    前台代码：

     <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <div>
            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            <cc1:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server" TargetControlID="TextBox1"
             MinimumPrefixLength="1" ServiceMethod="GetProductName" ServicePath="WebService.asmx">
            </cc1:AutoCompleteExtender>
        </div>

    后台WebService代码：

using System;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Data;
using System.Data.SqlClient;
using System.Web.Script.Services;//关键程序集引用
using System.Collections.Generic;//关键程序集引用

/// <summary>
/// WebService 的摘要说明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ScriptService()]//一定要添加
public class WebService : System.Web.Services.WebService {

    public WebService () {

        //如果使用设计的组件，请取消注释以下行
        //InitializeComponent();
    }

    [WebMethod]
    [ScriptMethod]
    public string[] GetProductName(string prefixText, int count)
    {
        List<string> suggestions=new List<string>();//声明一泛型集合
        SqlConnection con = new SqlConnection("server=.;database=NorthWind;uid=sa;pwd=;");
        con.Open();
        SqlCommand com = new SqlCommand("select distinct productname from Products where productname like @prefixname order by productname", con);
        com.Parameters.Add("@prefixname",SqlDbType.NVarChar).Value=prefixText + "%";
        SqlDataReader sdr = com.ExecuteReader();
        while (sdr.Read())
        {
            suggestions.Add(sdr.GetString(0));
        }
         sdr.close();
        con.close();
        return suggestions.ToArray();
    }
}