Protect single file!

Question

Hi!

I'm trying to protect a folder and the files inside it.
I'm able to protect the folder itself, so that if somebody clicks on it he will get a message: "You don't currently have permission to access this folder!"

But I can still access files in that folder. For example, if somebody knows the name of a file inside the folder he can type D:\ProtectedFolder\pdffile.pdf and he can open the file!

So, my question is:

Can I protect single files inside the folder?

This is the function that I use for folder lock:

   Public Function Lock(ByVal folder As
 String, ByVal user As String)
        Dim FilePath As String = folder
         Dim fs As FileSystemSecurity = File.GetAccessControl(FilePath)
         fs.AddAccessRule(New FileSystemAccessRule(user,
 FileSystemRights.ListDirectory,
 AccessControlType.Deny))
         fs.AddAccessRule(New FileSystemAccessRule(user,
 FileSystemRights.FullControl,
 AccessControlType.Deny))
         File.SetAccessControl(FilePath, fs)
       Return 0

    End Function

Thanks!

Answer 1

You will also have to deny FileSystemRights.Read if you want to prevent that. And technically you have to make sure that the files inherited their rights from the folder.

Answer 2

Specify FileShare.None for File.Open. You can see my C# implementation of it here with full source code. Convert it to VB.NET if you'd like.

This is the message you receive when trying to open a file locked by the application:

I think that's what you're after.