Find all textbox control in a page
<p>i am trying to use http Module to disable textbox of each page. Here is my sample coding</p>

<pre><code>  public void context_OnPreRequestHandlerExecute(object sender, EventArgs args)
    {
        try
        {
            HttpApplication app = sender as HttpApplication;
            if (app != null)
            {
                Page page = app.Context.Handler as Page;
                if (page != null)
                {
                    page.PreRender += OnPreRender;
                    page.PreLoad += onPreLoad;
                }
            }



        }
        catch (Exception ex)
        {
            throw new ApplicationException(ex.Message);
        }
    }


    public void OnPreRender(object sender, EventArgs args)
    {
        Page page = sender as Page;
        if (page.IsCrossPagePostBack)
        {
            DisableAllTextBoxes(page);
        }

    }

    private static void DisableAllTextBoxes(Control parent)
    {

        foreach (Control c in parent.Controls)
        {
            var tb = c as Button;
            if (tb != null)
            {
                tb.Enabled = false;
            }
            DisableAllTextBoxes(c);
        }

    }
</code></pre>

<p>This coding can work very well but when i use server.transer to another page. Button are not able to disable already. 
For example webform1 transfer to webform2. Webform 1's button is able to disable but webform2 is not able to disable. Can anyone solve my problem?</p>
