JQuery ui datepicker

JQuery ui datepicker

hi,
i had implemented jquery ui datepicker,but its not working.
please refer my code i had written,

<head>
    <meta name="viewport" content="width=device-width" />
    <title>Test</title>
    <link href="~/Content/jquery.ui.all.css" rel="stylesheet" />
    <script src="~/Scripts/jquery-1.10.2.js"></script>
    <script src="~/Scripts/ui/jquery.ui.core.js"></script>
    <script src="~/Scripts/ui/jquery.ui.widget.js"></script>
    <script src="~/Scripts/ui/jquery.ui.datepicker.js"></script>
    <link href="~/Content/demos.css" rel="stylesheet" />
    <script>
        $(function () {
            $("#dt").datepicker();
        });
    </script>
</head>
<body>
    <p>Date: <input type="text" id="dt"></p>

    <div class="demo-description">
        <p>The datepicker is tied to a standard form input field.  Focus on the input (click, or use the tab key) to open an interactive calendar in a small overlay.  Choose a date, click elsewhere on the page (blur the input), or hit the Esc key to close. If a date is chosen, feedback is shown as the input's value.</p>
    </div>
</body>



i am getting error ,

0x800a01b6 - JavaScript runtime error: Object doesn't support property or method 'datepicker'

please suggest me.

archana