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

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

[assembly:AssemblyVersion("1.0.0.0")]
[assembly:AssemblyKeyFile("key.snk")] 

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

   public static string GetData(string str)
   {
      // Code here is not subject to the permission demand
      // Determine the folder at runtime
      string strFolder = folder;
      FileIOPermission fio = new FileIOPermission(
         FileIOPermissionAccess.Read, strFolder);
      fio.Demand();
      string strFile = folder + @"\" + str;
      StreamReader sr = new StreamReader(strFile);
      return sr.ReadToEnd();
   }
}