// (c) 2006 Richard Grimes
// www.grimes.demon.co.uk

using System;
using System.IO;
using System.Security;
using System.Security.Permissions;

[assembly: FileIOPermission(SecurityAction.RequestOptional, Read = @"c:\SecureFolder\public_data.txt")]
[assembly: FileIOPermission(SecurityAction.RequestOptional, Read = @"c:\SecureFolder\secret_data.txt")]

class App
{
   const string folder = @"C:\SecureFolder";

   static void Main()
   {
      try
      {
         string str = GetString("public_data.txt");
         Console.WriteLine(str);
         str = GetString("secret_data.txt");
         Console.WriteLine(str);
      }
      catch(SecurityException e)
      {
         Console.WriteLine(e.Message);
      }
   }

   static string GetString(string str)
   {
      string strFile = folder + @"\" + str;
      StreamReader sr = new StreamReader(strFile);
      return sr.ReadToEnd();
   }
}