In my application jquery autocomplete control is not working ? when iam debugging time the Breakpoint not highlited why ?

In my application jquery autocomplete control is not working ? when iam debugging time the Breakpoint not highlited why ?

In Materpage.master
 <link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery-ui.min.js"></script> 
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery.ui.autocomplete.js" type="text/javascript"></script>

Signup.aspx child page

<script type="text/javascript">

    $(document).ready(function () {
        SearchText();
    });
    function SearchText() {
        
        $(".autosuggest").autocomplete({
            source: function (request, response) {
                $.ajax({
                    type: "POST",
                    contentType: "application/json; charset=utf-8",
                    url: "Sign_Up.aspx/GetAutoCompleteData",

                    data: "{'university':'" + document.getElementById('txtuniv_name').value + "'}",
                    dataType: "json",
                    success: function (data) {
                        response(data.d);
                    },
                    error: function (result) {
                        alert("Error");
                    }
                });
            }
        });
    }
    </script>
 




<asp:Label for="univ_name" CssClass="label" runat="server" >University Name:</asp:Label>
                        <asp:TextBox ID="txtuniv_name" CssClass="text" runat="server"  class="autosuggest"
                            placeholder="IIT" />