Creating a hidden field in codebehind and accessing it via clientside javascript

Question

I want to add a hidden field programmatically to an asp.net page, read and change it via javascript. So far my code fails at reading the added hidden field.

Here is a si

Answer 1

The main problem was that the following line was missing in the aspx page:

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>

The codebehind was never executed.