C#

using System;
using System.IO;
using System.Security.AccessControl;
using System.Windows.Forms;

namespace FileSystemExample
{
    class FileExample
    {
        public static void Main()
        {
            string DomainName = System.Environment.UserDomainName.ToString();
            DomainName += @"\";
            string AccountName = System.Environment.UserName.ToString();
            DomainName += AccountName;
                 

            try
            {
                string folderName = @"C:\Inetpub\ftproot";

                Console.WriteLine("Adding access control entry for "
                    + folderName);

                // Add the access control entry to the file.
                AddFileSecurity(folderName,DomainName,FileSystemRights.WriteExtendedAttributes, AccessControlType.Allow);

                Console.WriteLine("Removing access control entry from "
                    + folderName);

                // Remove the access control entry from the file.

                  RemoveFileSecurity(folderName, DomainName,FileSystemRights.WriteExtendedAttributes, AccessControlType.Allow);

                Console.WriteLine("Done.");
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }

        // Adds an ACL entry on the specified file for the specified account.
        public static void AddFileSecurity(string folderName, string account,
            FileSystemRights rights, AccessControlType controlType)
        {


            // Get a FileSecurity object that represents the
            // current security settings.
            FileSecurity fSecurity = File.GetAccessControl(folderName);

            // Add the FileSystemAccessRule to the security settings.
            fSecurity.AddAccessRule(new FileSystemAccessRule(account,
                rights, controlType));

            // Set the new access settings.
            File.SetAccessControl(folderName, fSecurity);

        }

        // Removes an ACL entry on the specified file for the specified account.
        public static void RemoveFileSecurity(string folderName, string account,
            FileSystemRights rights, AccessControlType controlType)
        {

            // Get a FileSecurity object that represents the
            // current security settings.
            FileSecurity fSecurity = File.GetAccessControl(folderName);

            // Remove the FileSystemAccessRule from the security settings.
            fSecurity.RemoveAccessRule(new FileSystemAccessRule(account,
                rights, controlType));

            // Set the new access settings.
            File.SetAccessControl(folderName, fSecurity);

        }
    }
}