Con este truco de visual Basic.Net podrás recorrer todos los ficheros de un directorio y todos sus subdirectorios de forma recursiva.

Puedes utilizarla para copiar ficheros, borrarlos, listarlos, etc…

Función:

 Private Sub Recursive( _
    ByVal sourceDir As String, _
       ByVal fRecursive As Boolean)

        Dim i As Integer
        Dim posSep As Integer
        Dim sDir As String
        Dim aDirs() As String
        Dim sFile As String
        Dim aFiles() As String

        If Not sourceDir.EndsWith(System.IO.Path.DirectorySeparatorChar.ToString()) Then
            sourceDir &= System.IO.Path.DirectorySeparatorChar
        End If

        If fRecursive Then

            aDirs = System.IO.Directory.GetDirectories(sourceDir)

            For i = 0 To aDirs.GetUpperBound(0)

                posSep = aDirs(i).LastIndexOf("\")

                sDir = aDirs(i).Substring((posSep + 1), aDirs(i).Length - (posSep + 1))

                Recursive(aDirs(i), fRecursive)
            Next

        End If

        Dim tFiles() As String
        tFiles = System.IO.Directory.GetFiles(sourceDir)

        Dim j As Int32 = 0
        Dim n As Int32 = 0
        n = tFiles.Length - 1
        Try
            For j = 0 To n
                MessageBox.Show(tFiles(j))
            Next

        Catch ex As Exception

        End Try

    End Sub