Public Function FindFolderNode( _
   ByVal text As String, _
   ByRef folderAddIndex As Integer _
) As FolderNode(Of N)

Dim instance As Tree(Of T,N)
Dim text As String
Dim folderAddIndex As Integer
Dim value As FolderNode(Of N)
 
value = instance.FindFolderNode(text, folderAddIndex)

public FolderNode<N> FindFolderNode( 
   string text,
   out int folderAddIndex
)