Ajax AutoCompleteExtender不工作。Web服务工作

这是C.NET 2.0。我正在使用母版页。

• WebService本身运行良好。
• 我完全被难住了。当我输入文本框时,什么都不会发生。

文件夹:

编辑软件 自动完成.asmx 应用程序代码/自动完成.cs

编辑票据.aspx:

        <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc2" %>


        <asp:ScriptManager id="ScriptManager1" runat="server" EnablepageMethods="true">
        <Services>
            <asp:ServiceReference Path="AutoComplete.asmx" />
        </Services>
        </asp:ScriptManager>

    <cc2:AutoCompleteExtender
         runat="server" 
         ID="AutoCompleteExtender1" 
         ServicePath="AutoComplete.asmx" 
         ServiceMethod="AutoComplete2" 
         MinimumPrefixLength="1" 
         CompletionSetCount="12" 
         TargetControlID="TextBox3" 
         EnableCaching="True" >
     </cc2:AutoCompleteExtender>

<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>

自动完成.asmx:

<%@ WebService Language="C#" CodeBehind="~/App_Code/AutoComplete.cs" Class="AutoComplete" %>

自动完成.cs:

using System;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Script.Services;
using System.Web.Services.Protocols;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;


/// <summary>
/// Summary description for AutoComplete
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ScriptService]
public class AutoComplete : System.Web.Services.WebService {

    public AutoComplete () {

        //Uncomment the following line if using designed components 
        //InitializeComponent(); 
    }

    [WebMethod]
    [ScriptMethod]
    public string[] AutoComplete2(string prefixText,int count)
    {
        string conString = ConfigurationManager.ConnectionStrings["DB"].ConnectionString;
        SqlConnection connection = new SqlConnection(conString);
        connection.Open();
        SqlParameter prm;
        string sql = "Select program_name FROM CM_Programs WHERE program_name LIKE @prefixText";
        SqlDataAdapter cmd = new SqlDataAdapter(sql, connection);
        prm = new SqlParameter("@prefixText", SqlDbType.VarChar, 50);
        prm.Value = prefixText+ "%";
        cmd.SelectCommand.Parameters.Add(prm);
        DataTable dt = new DataTable();
        cmd.Fill(dt);
        string[] items = new string[dt.Rows.Count];
        int i = 0;
        foreach (DataRow dr in dt.Rows)
        {
            items.SetValue(dr["program_name"].ToString(),i);
            i++;
        }
        connection.Close();
        return items;
    } 
}