div is not updating inside update pannel

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C#

ASP.NET

Javascript

jQuery

I have a div that contain two child div my problem is the child div is not showing

here is my aspx page code

 <script type="text/javascript">
function loadScript()
{
    $("#Info_dialog").dialog("destroy");

            $("#Info_dialog").dialog({
                resizable: false,
                draggable: false,
                width: 300,
                modal: true,
                autoOpen: false,
                buttons: {
                    OK: function () {
                        $(this).dialog("close");
                    }
                },
                zindex: 2000,
                title: 'Message'
            });
            
            if ($("#Info_dialog").children().length > 0) 
            {
                  $("#Info_dialog").dialog("open");
            }
}

var Manager = Sys.WebForms.PageRequestManager.getInstance();
Manager.add_endRequest(function () {
loadScript();
});
  $(function () {
            loadScript();                     
        });
    </script>

....................

 <asp:UpdatePanel ID="up_FileContainer" runat="server">
 <ContentTemplate>
 div id="Info_dialog" style="display: none;" runat="server" clientidmode="Static">
 <div class="infobar_green"  runat="server" id="div_info" visible="false">
  <asp:Literal ID="Lt_info" runat="server" Text="Record saved successfully!" />
  </div>
<div class="infobar_red"  runat="server" id="div_error" visible="false">
   <asp:Literal ID="Lt_error" runat="server" Text="" />
</div>
</div>
<div id="FileContainerDiv"  runat="server" class="fileblockcontainer">
<div class="file_block">
</div>
</ContentTemplate>
</asp:UpdatePanel>

and here is my .cs code

 if (IsPostBack)
 {
   string ErrorString;
  if (!SomeFunc(out ErrorString))
   {
                   div_info.Visible = false;
                   Lt_error.Text = ErrorString;
                   div_error.Visible = true;
    }
    else
    {
                   div_info.Visible  = true;
                   div_error.Visible = false;

    }

}

here child div is not showing or not showing even i inspect element in chrome