Restriction to a folder from being access

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.NET3.5

C#

.NET

WebForms

C#4.0

, +

hi I have a folder in my root directory and it contain a text document.I want to restrict that document from being access.In my default.aspx page a button is present.
My folder structure looks like

- NewFolder1 (I want to restrict this folder)
    Secret.txt
    web.config
- Default.aspx
    Default.aspx.cs
  web.config

I was googling for come over this but i am unable
I wrote inside web.config(NewFolder1) file:

<system.web>
     <authorization>
       <deny users="*"/>
     </authorization>
   </system.web>

and some where i found to do like

<location path="NewFolder1">
    <system.web>
      <authorization>
        <deny users="*"/>
      </authorization>
    </system.web>
  </location>

but still the same please suggest me how would i come across the problem.
Thanks.