since your db is safe, take this code :
and store it in your databade, on your login button event, download this code and execute it. how to do so ?
check "CodeDom"
and here's a Link Click Here
when the user add a file,compress that file into a zip file and store it into a protected folder. and create a fake image of that file in your listview and store the directory info for each file in your app for later use..such as extracting.
1) how to zip files (extract,move)
2) how to protect a folder
1) reference the System.IO.Compression.FileSystem form /Windows/Microsoft.NET/assembly/GAC_MSIL/System.IO.Compression.FileSystem/System.IO.Compression.FileSystem.dll
Imports System.IO
Imports System.IO.Compression
Module Module1
Sub Main()
Dim startPath As String = "c:\example\start"
Dim zipPath As String = "c:\example\result.zip"
Dim extractPath As String = "c:\example\extract"
ZipFile.CreateFromDirectory(startPath, zipPath)
ZipFile.ExtractToDirectory(zipPath, extractPath)
End Sub
End Module
reference : ZipFile Class
2) Protect Folder
Imports System.Security.AccessControl
Imports System.IO
Remove access from folder
Dim FilePath As String = "The Folder you want to protect"
Dim fs As FileSystemSecurity = File.GetAccessControl(FilePath)
' Please Change User if needed (C:\Users\"USER")
fs.AddAccessRule(New FileSystemAccessRule("User", FileSystemRights.FullControl, AccessControlType.Deny))
File.SetAccessControl(FilePath, fs)
Add access to folder
Dim FilePath As String = "The Folder you want to protect"
Dim fs As FileSystemSecurity = File.GetAccessControl(FilePath)
' Please Change User if needed (C:\Users\"USER")
fs.RemoveAccessRule(New FileSystemAccessRule("User", FileSystemRights.FullControl, AccessControlType.Deny))
File.SetAccessControl(FilePath, fs)
Gd Luck