using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Security.AccessControl;
using System.Security.Principal;

namespace ChangeFileOwner
{
    class ChangeFileOwner
    {
        static void Main(string[] args)
        {
            if (args.Length != 1)
            {
                Console.WriteLine("Usage: changefileowner.exe <filename>");
                Environment.Exit(1);
            }
            string filename = args[0];

            if ( !File.Exists(filename) )
            {
                Console.WriteLine("File not found: " + filename);
                Environment.Exit(2);
            }

            FileSecurity acl = File.GetAccessControl(filename);
            IdentityReference owner = acl.GetOwner(typeof(NTAccount));
            Console.WriteLine(owner); // SID

            //step 2 
            NTAccount ntAccount = new NTAccount("DAO", "Administrator");
            acl.SetOwner(ntAccount);

            FileSystemAccessRule facls = new FileSystemAccessRule(owner, FileSystemRights.Read, AccessControlType.Allow);
            acl.RemoveAccessRuleAll(facls);
            

            try
            {
                File.SetAccessControl(filename, acl);
            }
            catch (InvalidOperationException ex)
            {
                Console.WriteLine("You cannot assign ownership to that user." +
                "Either you don't have TakeOwnership permissions, or it is not your user account."
                );
                throw;
            }
        }
    }
}