folder locking program
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Security.AccessControl;
using System.DirectoryServices;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string Directoryd = "D:";
            string mydirectory = Directoryd + "\" + "rs\";
            if (!Directory.Exists(mydirectory))
            {
                Directory.CreateDirectory(mydirectory);
            }
            DirectoryInfo di = new DirectoryInfo(mydirectory);
            DirectorySecurity ds = di.GetAccessControl();


            ds.AddAccessRule(new FileSystemAccessRule(@"everyone", FileSystemRights.FullControl, AccessControlType.Deny));
            di.SetAccessControl(ds);


        }


        }

}

private void login_Click(object sender, EventArgs e)
        {
string username = text1.Text;
string password = text2.Text;
if(username == "aname" && password == "password")
{
 string Directoryd = "D:";
                string mydirectory = Directoryd + "\" + "rs\";
                if (!Directory.Exists(mydirectory))
                {
                    Directory.CreateDirectory(mydirectory);
                }
                DirectoryInfo di = new DirectoryInfo(mydirectory);
                DirectorySecurity ds = di.GetAccessControl();


                ds.AddAccessRule(new FileSystemAccessRule(@"everyone", FileSystemRights.FullControl, AccessControlType.Allow));
                di.SetAccessControl(ds);


}
        }