How To make Folder Lock Software ?

https://bitsbyta.blogspot.com/2011/01/lock-and-unlock-folder-cnet.html

The following code shows you how to lock and unlock a folder. User can browse the specific folder to lock/Unlock it.

using System.IO;
using System.Security.AccessControl;
private void btnBrowse_Click(object sender, EventArgs e)
{
   if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
   {
       textBox1.Text = folderBrowserDialog1.SelectedPath;
   }
}
private void btnLock_Click(object sender, EventArgs e)
{
    try
    {
        string folderPath = textBox1.Text;
        string adminUserName = Environment.UserName;// getting your adminUserName
        DirectorySecurity ds = Directory.GetAccessControl(folderPath);
        FileSystemAccessRule fsa = new FileSystemAccessRule(adminUserName,  FileSystemRights.FullControl, AccessControlType.Deny)
        ds.AddAccessRule(fsa);
        Directory.SetAccessControl(folderPath, ds);
        MessageBox.Show("Locked");
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}
private void btnUnLock_Click(object sender, EventArgs e)
{
    try
    {
        string folderPath = textBox1.Text;
        string adminUserName = Environment.UserName;// getting your adminUserName
        DirectorySecurity ds = Directory.GetAccessControl(folderPath);
        FileSystemAccessRule fsa = new FileSystemAccessRule(adminUserName,  FileSystemRights.FullControl, AccessControlType.Deny)
        ds.RemoveAccessRule(fsa);
        Directory.SetAccessControl(folderPath, ds);
        MessageBox.Show("UnLocked");
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    } 
}

https://www.instructables.com/How-To-Lock-Folder-without-any-software/