Асинхронно загрузить данные

<LoggedInTemplate >   
               <p> 
             Здравствуйте, <a id="fio_hr" runat="server" class="username" href="~/Account/profile.aspx" title="Manage your account"> 
               <%= Firstname %>(<% =Balance %>)<%--<asp:LoginName runat="server" CssClass="username" />--%> 
                     </a>! 
                                                             
                                                             
     <asp:LoginStatus runat="server" LogoutAction="Redirect" LogoutText="Выход" LogoutPageUrl="~/" /> 
       </p> 
  </LoggedInTemplate>

$.ajax({ 
            type: "POST", 
            url: '/Account/GetBalance', 
            contentType: "application/json; charset=utf-8", 
            dataType: 'json', 
    error: function (errorms) { 
 
        console.log(errorms) 
        
            }, 
            success: (json) => { 
                
                console.log('-----') 
                $('#balance').html(json) 
            } 
             })

string balance = WorkWithAct.GetSum1c1(cod1c, organiz_id); 
                 
                Response.Clear(); 
                Response.ContentType = "application/json; charset=utf-8"; 
                 
                Response.Write(balance); 
                Response.End();