I Want To Auto Implement Textbox M Using Webservice ,Webservice Works Fine, But Javascript Give Me Error I Dnt Knw Why

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i want to auto implement textbox in vb.net using webservices my webservice codes works fine its give me result in xml file when i revoke it .
but in javascript its giveing me error i dont knw can some 1 help me.
thanks in advance.

my webservice code is ....

Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.ComponentModel
Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
Imports System.Collections.Generic
Imports System.Web



<System.Web.Services.WebService(Namespace:="http://tempuri.org/")> _
<System.Web.Services.WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<ToolboxItem(False)> _
Public Class companynameWebService
    Inherits System.Web.Services.WebService
    <WebMethod()> _
    Public Function GetStudentNames(ByVal searchTerm As String) As List(Of String)
        Dim studentNames As New List(Of String)()
        Dim cs As String = ConfigurationManager.ConnectionStrings("raulCS").ConnectionString
        Using con As New SqlConnection(cs)
            Dim cmd As New SqlCommand("spGetmatchingcompanyname", con)
            cmd.CommandType = CommandType.StoredProcedure

            Dim parameter As New SqlParameter("@Company", searchTerm)
            cmd.Parameters.Add(parameter)
            con.Open()
            Dim rdr As SqlDataReader = cmd.ExecuteReader()
            While rdr.Read()
                studentNames.Add(rdr("CompanyName").ToString())
            End While
        End Using
        Return studentNames
    End Function


End Class

my javascript code is : it giving me error function dnt knw why

<script type="text/javascript" language="javascript">
       $(function () {

           $('#<%= txtsearch.ClientID %>').autocomplete({
               source: function (request, response) {
                   $.ajax({
                       url: "companynameWebService.asmx/GetStudentNames",
                       data: "{ 'searchTerm': '" + request.term + "' }",
                       type: "POST",
                       dataType: "json",
                       contentType: "application/json;charset=utf-8",
                       success: function (result) {
                           response(result.d);
                       },
                       error: function (result) {
                           alert('There is a problem processing your request');
                       }
                   });
               },
               minLength: 0
           });
       });
   </script>