asp.net mvc - Why online Jquery Datepicker work, but local Jquery Datepicker not work in MVC project -

i have issue in mvc project.

i tested in create.cshtml add code :

<link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css"> <script src="//code.jquery.com/jquery-1.9.1.js"></script> <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script>  <script> $(function() { $( "#datepicker" ).datepicker(); }); 

and textbox input :

<input type="text" id="datepicker"> 

and worked, when click or keypress on textbox, datepicker popup show up.

but when want javascript , css file run locally in pc put in _layout.cshtml (behave general in page) :

@scripts.render("~/scripts/jquery-1.9.1.js") @scripts.render("~/scripts/jquery-ui.js") @styles.render("~/content/themes/base/jquery-ui.css") @rendersection("scripts", required: false) 

and remark direct link jquery online (source) in create.cshtml , after run page doesn't show datepicker, missing issue ?

ps: save jquery-1.9.1.js , jquery-ui.js , jquery-ui.css in local pc

because path of file missing on local.

<link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css"> <script src="//code.jquery.com/jquery-1.9.1.js"></script> <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script> 

change to

<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css"> <script src="http://code.jquery.com/jquery-1.9.1.js"></script> <script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script>