Applying User Permissions on any Folder using C#

Applying user permissions on any folder using C#.

using System;

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

namespace ChangeFolderPermission

{
    class Program
    {
        static void Main(string[] args)
        { 
            string desktopFolderPath = @"D:\Temp";
            FileSystemAccessRule iis_iusrs = new FileSystemAccessRule("IIS_IUSRS",
                FileSystemRights.FullControl,
                InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit,
                PropagationFlags.None,
                AccessControlType.Allow);
            FileSystemAccessRule networkService = new FileSystemAccessRule("NETWORK SERVICE",
                FileSystemRights.FullControl,
                InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit,
                PropagationFlags.None,
                AccessControlType.Allow);
            System.IO.DirectoryInfo desktopFolderDirectory = new System.IO.DirectoryInfo(desktopFolderPath);
            DirectorySecurity directorySecurity = null; 
            if (!desktopFolderDirectory.Exists)
            {
                System.IO.Directory.CreateDirectory(desktopFolderPath);
                directorySecurity = desktopFolderDirectory.GetAccessControl();
                directorySecurity.AddAccessRule(iis_iusrs);
                directorySecurity.AddAccessRule(networkService);
                desktopFolderDirectory.SetAccessControl(directorySecurity);
            }
            else
            {
                directorySecurity = desktopFolderDirectory.GetAccessControl();
                directorySecurity.AddAccessRule(iis_iusrs);
                directorySecurity.AddAccessRule(networkService);
                desktopFolderDirectory.SetAccessControl(directorySecurity);
            }
        }
    }
}