ใช้ datepicker ใน asp.net vb พอรันแล้ว ขึ้น Microsoft JScript runtime error: '$' is undefined แก้ยังไงครับ

<script type="text/javascript" src="~/jQueryUI/js/jquery-1.9.0.js"></script>
<script type="text/javascript" src="~/jQueryUI/js/jquery-ui-1.10.0.custom.js"></script>
<link rel="stylesheet" href="~/jQueryUI/css/redmond/jquery-ui-1.10.0.custom.css" />
<link rel="stylesheet" href="~/jQueryUI/development-bundle/themes/redmond/jquery-ui.css" />
<!-- กำหนดขนาดของ datepicker -->
<style type="text/css">
.ui-datepicker{
	width:250px;
	font-family:tahoma;
	font-size:14px;
	text-align:center;
}
</style>

<script type="text/javascript">

 $(document).ready(function() {
  $(function() {
    $( "#datepicker" ).datepicker();
  });
});


  </script>