jquery autocomplete not working though json is success

<script type="text/javascript" src="jsfiles/validation.js"></script>
    <script type="text/javascript" src="jsfiles/SearchScript.js"></script>
    <link rel="stylesheet" href="windowfiles/dhtmlwindow.css" type="text/css" />
    <script language="javascript" type="text/javascript" src="windowfiles/dhtmlwindow.js"></script>
    <link href="css/jquery-ui.css" rel="stylesheet" type="text/css" />
    <script type="text/javascript" src="jsfiles/jquerymin.js" language="javascript"></script>
    <script type="text/javascript" src="jsfiles/jquery-ui.min.js" language="javascript"></script>
    <link href="jquery-ui-1817/development-bundle/demos/demos.css" rel="stylesheet" type="text/css" />
    <script type="text/javascript" >

        $(function () {
            var cache = {}, lastXhr;
            $("#Grid_RouteDetailCode_ftxtLocationName").autocomplete({
                minLength: 1,

                source: function (request, response) {
                    var term = request.term;
                    if (term in cache) {
                        response(cache[term]);
                        return;
                    }

                    lastXhr = $.getJSON("GetAutoComplete.aspx?r=" + Math.random() + "&name=" + request.term, request, function (data, status, xhr) {

                        cache[term] = data;

                        if (xhr === lastXhr) {
                            response(data);
                        }
                    });
                },
                select: function (event, ui) {
                    // document.getElementById("birds").value == ui.item.id;
                    //var a = ui.item.id;
                    document.getElementById("locationroute").value = ui.item.id;
                    // document.getElementById("TextBox1").value = ui.item.id;
                    //alert(ui.item.id);
                }
            });

        });

Imports System.Data, System.Data.SqlClient, System.Configuration

Partial Class GetAutoComplete
    Inherits System.Web.UI.Page
    Dim con As SqlConnection
    Dim cmd As SqlCommand
    Dim read As SqlDataReader
    Dim collected_Names As String = ""
    Dim sa As String = ConfigurationManager.ConnectionStrings("AVLS_MDT_HMS_TTK_FINALConnectionString").ToString()
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        con = New SqlConnection(sa)
        con.Open()
        Dim str_Name As String = Trim(Request.QueryString("name"))
        Dim query As String = "select  distinct(Location_Name),id from TMS_Route_Detail_Table where Location_Name like '" & str_Name & "%'"
        cmd = New SqlCommand(query, con)
        read = cmd.ExecuteReader()
        Dim shar As String = ""
        collected_Names = "["

        Do While read.Read()
            collected_Names += "{""" & "id"":""" & read(1) & """,""label"":""" & read(0).ToString().ToUpper() & """,""value"":""" & read(1) & """" & "},"
        Loop
        read.Close()
        con.Close()
        If (collected_Names.Length > 1) Then
            collected_Names = collected_Names.Remove(collected_Names.Length - 1, 1)
        End If
        collected_Names += "]"

        Response.Write(collected_Names)
    End Sub
End Class