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

namespace FileOperation
{
    class Program
    {
        static void FileHidden()
        {
            string filePath = @\"d:\\file\";
            DirectoryInfo dir = new DirectoryInfo(filePath);
            FileInfo[] fileInfo = dir.GetFiles();

            foreach (FileInfo file in fileInfo)
            {
                string fileName = file.FullName;
                File.SetAttributes(fileName,FileAttributes.Hidden);
            }
        }
        static void Main(string[] args)
        {
            FileHidden();
            Console.ReadKey();
        }
    }
}