jquery ajax get xml data

Step 1 : Modify the code in GetHelpText.aspx.cs as shown below. 

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Xml.Serialization;

namespace Demo
{
    public partial class GetHelpText : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Response.ContentType = "text/xml";
            XmlSerializer xmlSerializer = new XmlSerializer(typeof(HelpText));
            xmlSerializer.Serialize(Response.OutputStream,
                GetHelpTextByKey(Request["HelpTextKey"]));
        }

        private HelpText GetHelpTextByKey(string key)
        {
            HelpText helpText = new HelpText();

            string cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
            using (SqlConnection con = new SqlConnection(cs))
            {
                SqlCommand cmd = new SqlCommand("spGetHelpTextByKey", con);
                cmd.CommandType = CommandType.StoredProcedure;
                SqlParameter parameter = new SqlParameter("@HelpTextKey", key);
                cmd.Parameters.Add(parameter);
                con.Open();
                helpText.Text = cmd.ExecuteScalar().ToString();
                helpText.Key = key;
            }

            return helpText;
        }
    }

    public class HelpText
    {
        public string Key { get; set; }
        public string Text { get; set; }
    }
}

Step 2 : Modify the jQuery code in HtmlPage1.html as shown below 

$(document).ready(function () {
    var textBoxes = $('input[type="text"]');
    textBoxes.focus(function () {
        var helpDiv = $(this).attr('id');
        $.get('GetHelpText.aspx', { HelpTextKey: helpDiv }, function (response) {
            var jQueryXml = $(response);
            var textElement = jQueryXml.find("Text");

            $('#' + helpDiv + 'HelpDiv').html(textElement.text());
        }, 'xml');
    });

    textBoxes.blur(function () {
        var helpDiv = $(this).attr('id') + 'HelpDiv';
        $('#' + helpDiv).html('');
    });
});

Please Note :
1. Use fiddler to inspect the data that is sent to and received from GetHelpText.aspx
2. Type the following URL in the browser to see the generated XML
http://localhost:PortNumber/GetHelpText.aspx?HelpTextKey=firstName 

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