jquey ajax request httphandler

1.new httphandler:

<%@ WebHandler Language="C#" Class="AjaxHandler" %>

using System;
using System.Web;

public class AjaxHandler : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";

        System.Collections.Generic.List<System.Collections.Generic.Dictionary<string, string>> parent = new GucDataFetchEntLib.GucAddressingDao().GetDataCenter();
        System.Web.Script.Serialization.JavaScriptSerializer js = new System.Web.Script.Serialization.JavaScriptSerializer();

        context.Response.Write(js.Serialize(parent));
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }

}

2.call httphandler in page 

function ajaxPageMethod() {
            $.ajax({
                type: "GET",
                contentType: "application/json",
                url: "AjaxHandler.ashx",
                success: function (list) {
                    alert(list);
                    $("#result").html(list);
                },
                error: function (xhr) {
                    $("#result").html("request wcf sever error!");
                }
            });
        }