treeview recursion

If you mean How to fill a Treeview here is a sample using recursion.
Start a new project. Add a module. Add a textbox (Text1), A Treeview (TV), 2 command Buttons (cmdBegin, cmdClose)
Add this code to the Form. Run the program and key in a folder starting point such as "C:\Windows" into the text box. For quicker response and no Recursion, drop the ,True from the FillTreeView statement in cmdBegin_Click.

option Explicit

private Sub cmdBegin_Click()
TV.Nodes.Clear
TV.Nodes.Add , , "Root", Left(Text1.Text, 2) ' Node One
TV.Nodes(1).Expanded = true ' Expand it
FillTreeview Text1.Text, "Root", true
End Sub

private Sub cmdClose_Click()
Unload me
End Sub

public Sub FillTreeview(Path as string, Parent as string, optional Recurse as Boolean = false)
static Key as string
Dim hwnd, WFD as WIN32_FIND_DATA
Dim X as Integer
Dim fn as string
Dim idx, pth as string
Dim MyChild as Integer
Dim Iam as string
If Key = "" then Key = GetQualifier
MyChild = 1
pth = Path ' get Folder to work on
If Right(pth, 1) <> "\" then pth = pth & "\" ' right backslash
hwnd = FindFirstFile(pth & "*.*", WFD) ' get first file
If hwnd = -1 then Exit Sub ' nothing there
fn = StripNull(WFD.cFileName) ' clear trailing nulls
Do ' Find Children
If fn <> "." And fn <> ".." then
If (WFD.dwFileAttributes And vbDirectory) = vbDirectory then
TV.Nodes.Add Parent, tvwChild, Key & "." & CStr(MyChild), fn
TV.Nodes(TV.Nodes.Count).Tag = pth & fn
If Recurse then
FillTreeview pth & fn, Key & "." & CStr(MyChild), Recurse ' recurse
else
TV.Nodes.Add Key & "." & CStr(MyChild), tvwChild, Key & "." & CStr(MyChild) & "_Fake", "_Fake"
End If
MyChild = MyChild + 1 ' next Childs Identifire
End If
End If
X = FindNextFile(hwnd, WFD)
fn = StripNull(WFD.cFileName)
If (WFD.dwFileAttributes And vbDirectory) = vbDirectory then Key = GetQualifier
Loop Until X = 0
set hwnd = nothing
End Sub

public Function StripNull(byval WhatStr as string) as string
' Remove nulls from end of string
Dim pos as Integer
pos = InStr(WhatStr, Chr$(0))
If pos > 0 then
StripNull = Left$(WhatStr, pos - 1)
else
StripNull = WhatStr
End If
End Function

public Function GetFileName(P as string)
Dim X
X = InStrRev(P, "\", -1, vbTextCompare)
GetFileName = mid(P, X + 1)
End Function

public Function GetQualifier()
' Routine returns a twl character string like AA or AB or AC or BA or BB or BC etc
static Q1 as Integer
static Q2 as Integer
If Q1 = 0 then Q1 = 65
If Q2 = 0 then Q2 = 64
Q2 = Q2 + 1
If Q2 = Asc("Z") then
Q1 = Q1 + 1
Q2 = 65
End If
GetQualifier = Chr(Q1) & Chr(Q2)
End Function

private Sub TV_Expand(byval Node as MSComctlLib.Node)
If Node.Child = "_Fake" then
TV.Nodes.Remove Node.Child.Key
FillTreeview Node.Tag, Node.Key, true
End If
End Sub
'
'
'
' Add this code to the module

option Explicit
'
public Const MAX_PATH as Long = 260
public Const FILE_ATTRIBUTE_ARCHIVE = &H20
public Const FILE_ATTRIBUTE_COMPRESSED = &H800
public Const FILE_ATTRIBUTE_DIRECTORY = &H10
public Const FILE_ATTRIBUTE_HIDDEN = &H2
public Const FILE_ATTRIBUTE_NORMAL = &H80
public Const FILE_ATTRIBUTE_READONLY = &H1
public Const FILE_ATTRIBUTE_SYSTEM = &H4
public Const FILE_ATTRIBUTE_TEMPORARY = &H100

Type FileTime ' 8 Bytes
dwLowDateTime as Long
dwHighDateTime as Long
End Type

Type WIN32_FIND_DATA ' 318 Bytes
dwFileAttributes as Long
ftCreationTime as FileTime
ftLastAccessTime as FileTime
ftLastWriteTime as FileTime
nFileSizeHigh as Long
nFileSizeLow as Long
dwReserved¯ as Long
dwReserved1 as Long
cFileName as string * MAX_PATH
cAlternate as string * 14
End Type

public Declare Function FindFirstFile Lib "kernel32" Alias "FindFirstFileA" _
(byval lpFileName as string, lpFindFileData as WIN32_FIND_DATA) as Long
public Declare Function FindNextFile Lib "kernel32" Alias "FindNextFileA" (byval hFindFile as Long, lpFindFileData as WIN32_FIND_DATA) as Long
public Declare Function FindClose Lib "kernel32" (byval hFindFile as Long) as Long

John G