jquery datepicker inline value c#

c# run on the server
the jQuery calendar is built once the page is loaded by Jquery, in your browser
you browser have no idea of c#
c# have no idea of jQuery

you can send the value of the datepicker using usual method
<asp:TextBox id="datepicker" runat="server" />

$("#<%= datepicker.ClientID %>").datepicker(options);

I think I asked the question and didn't give enough information. I have a JQuery Datepicker, I need to get that value and use it in the code behind to call a SQL Database and use that value as a label on the same page as the calendar. I know how to create the label but do not know how to get the Datepicker value and use it in the code behind.

  <script>
  $(function() {
      $("#calendarwrapper").datepicker({
      numberOfMonths: [3,1],
      showButtonPanel: true
    });
  });
  </script>
[code]
[code]
        <div id="calendarwrapper">

        </div>

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I don't have a C# example, but I can tell you that the general design pattern is a jQuery/AJAX request that will dynamically call a script on the server.  This article explains the theory of the AJAX interaction.  I'll see if I can put together an example that uses the datepicker.
https://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/Jquery/A_10712-The-Hello-World-Exercise-with-jQuery-and-PHP.html

but do not know how to get the Datepicker value and use it in the code behind.

  $(function() {
      $("#calendarwrapper").datepicker({
            onSelect: function(date) {
               $("#<%= Hidden1.ClientID %>").val(date);
            },
            numberOfMonths: [3,1],
            showButtonPanel: true
    });
  });

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<asp:Hidden ID="Hidden1" runat="server">

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Awesome Ray. Thank you for your help

Thanks for the points, and best of luck with your project! ~Ray

look like you did it with Ray_Paseur solution :
https://www.experts-exchange.com/questions/28552099/jquery-datepicker-value-loses-value-after-postback.html

Ray_paseur use OnClose
I propose to use OnSelect

Wait... it's probably not the same project.. my bad.