Kebenaran fail dalam C#

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

public class Demo {
   public static void Main() {

      FileIOPermission file= new FileIOPermission(PermissionState.None);
      file.AllLocalFiles = FileIOPermissionAccess.Read;
      try {
         Console.WriteLine("Demands the permission to determine whether the application has
         permission to read the files");
         file.Demand();
      }
      catch (SecurityException s) {
         Console.WriteLine(s.Message);
      }
   }
}