asp.net jquery

I have below codes working fine with dropdown. but auto complete does not work.
It shows 'internal object error' which I don't know what it is. Anyone can help? You can copy/paste the code to your visual studio and it will show when you type something inside of the textbox.


<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication6.WebForm1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server"><title></title>
<link rel="Stylesheet" href="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.10/themes/redmond/jquery-ui.css" />
</head>
<body>
<form id="form1" runat="server">
<asp:DropDownList runat="server" ID="dropDown"></asp:DropDownList>
<br /><br />
<asp:TextBox runat="server" ID="txtCity"></asp:TextBox>
</form>
<script src="http://ajax.aspnetcdn.com/ajax/jquery/jquery-1.8.0.js"></script>
<script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.22/jquery-ui.js"></script>
<script type="text/javascript">
    $(function () {
        $("#txtCity").autocomplete({
            source: function (request, response) {
                var param = { cityName: $('#txtCity').val() };
                $.ajax({
                    url: "Default.aspx/GetProductListByKeyword",
                    data: JSON.stringify(param),
                    dataType: "json",
                    type: "POST",
                    contentType: "application/json; charset=utf-8",
                    dataFilter: function (data) { return data; },
                    success: function (data) {
                        response($.map(data.d, function (item) {
                            return {
                                value: item
                            }
                        }))
                    },
                    error: function (XMLHttpRequest, textStatus, errorThrown) {
                        alert(textStatus + ' ' + errorThrown + ' ' + XMLHttpRequest.toString());
                    }
                });
            },
            minLength: 1//minLength as 2, it means when ever user enter 2 character in TextBox the AutoComplete method will fire and get its source data.
        });
    });
</script>
</body>
</html>



'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

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.OleDb;
using System.Data;
using System.Configuration;
using System.Web.Services;
namespace WebApplication6
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
           
        }

        [WebMethod]
        public static List<string> GetProductListByKeyword(string keyword)
        {
            try
            {                
                    List<string> brandNames = new List<string>();                  
                    brandNames.Add("apple");
                    brandNames.Add("orange");
                    brandNames.Add("manago");
                    return brandNames;                
            }
            catch (Exception ex)
            {
                throw new ApplicationException("Something wrong in the query/database connection: ", ex);
            }

        }        
       
    }
}
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leakim971PluritechnicianCommented:
to start you send cityName line 19 instead keyword in your webmethod
theses parameters name need to match
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ITsolutionWizardAuthor Commented:
still not working after the changes
0
leakim971PluritechnicianCommented:
Out of my desk, I don't have VS currently, if you can publish your code to internet, I can help.
Which results do get when calling the web method directly? Could you post it?
0
ITsolutionWizardAuthor Commented:
codes already on the web here. if you can not do it, it is okay.
0
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