treeview - VB.NET 2008 Not recognizing Path.GetFileName Method -

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i have read post nothing works. visual basic not recognizing path.getfilename method following page in trying filename in visual basic application can't compile microsoft official page

private sub form1_load(byval sender system.object, byval e system.eventargs) handles mybase.load     size_mode_list.items.addrange([enum].getnames(gettype(pictureboxsizemode)))       each drive driveinfo in driveinfo.getdrives         dim node treenode = _             file_view_tree.nodes.add(drive.name)         node.tag = itemtype.drive         node.nodes.add("filler")     next  end sub  private sub file_view_tree_beforeexpand(byval sender system.object, byval e system.windows.forms.treeviewcanceleventargs) handles file_view_tree.beforeexpand     dim currentnode treenode = e.node     currentnode.nodes.clear()     try         'now go files , folders         dim fullpathstring string = currentnode.fullpath          'handle each folder         each dolderstring string in _             directory.getdirectories(fullpathstring)             dim newnode treenode = _                 currentnode.nodes.add(path.getfilename(folderstring))             dim x string = path.getfilename("")             newnode.tag = itemtype.folder             newnode.nodes.add("filler")         next          'handle each file         each filestring string in _             directory.getfiles(fullpathstring)             'get file name portion (without path) :             dim newnode treenode = _                 currentnode.nodes.add(path.getfilename(filestring))             newnode.tag = itemtype.file         next     catch ex exception     end try end sub 

'don't forget import imports system.io  'declare these private enum itemtype     drive     folder     file end enum  private sub form1_load(byval sender system.object, byval e system.eventargs) handles mybase.load     each drive driveinfo in driveinfo.getdrives         dim node treenode = _             file_view_tree.nodes.add(drive.name)         node.tag = itemtype.drive         node.nodes.add("filler")     next end sub  private sub file_view_tree_beforeexpand(byval sender system.object, byval e system.windows.forms.treeviewcanceleventargs) handles file_view_tree.beforeexpand     dim currentnode treenode = e.node     currentnode.nodes.clear()     try         'now go files , folders         dim fullpathstring string = currentnode.fullpath          'handle each folder         each folderstring string in _             directory.getdirectories(fullpathstring)             dim newnode treenode = _             currentnode.nodes.add(path.getfilename(folderstring))             dim x string = path.getfilename("")             newnode.tag = itemtype.folder             newnode.nodes.add("filler")         next          'handle each file         each filestring string in _             directory.getfiles(fullpathstring)             'get file name portion (without path) :             dim newnode treenode = _             currentnode.nodes.add(path.getfilename(filestring))             newnode.tag = itemtype.file         next     catch ex exception      end try end sub

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