Count nested id in sql server 2005

Suppose

i have a table treeview(tablename)  and four fields

nodeid,parentid,client_id and nodetype(it may be file or folder) 

Nodeid	Parentid	Client_id	nodetype	Folder_Name
1	1	2	Folder	A
2	1	2	Folder	B
3	1	2	Folder	C
4	2	2	Folder	D
5	2	2	Folder	E
6	3	2	Folder	F
7	3	2	File	G
8	4	2	Folder	H
9	4	2	Folder	I
10	3	2	Folder	J
11	3	2	Folder	K
12	5	2	Folder	L
13	8	2	Folder	M
14	9	2	Folder	N
15	10	2	Folder	O

These folders are nested like:

A

     B

          D

                H

                       M

                I

                       N     

          E

                L

     C

           F

           G

           J

                O

           K                 

Means ‘B’ is inside ‘A’ and ‘D’ is inside ‘B’

Now what I want to do

I want to count the folder if user click on ‘B’  it count all the folder that inside the ‘B’ and nested  in ‘B’

Show count=7 Folders

And  for the ‘C’ it count

Count=5

the query for this is:

WITH EmpCTE(nodeid, parentid, nodetype, lvl)
AS
(

  -- Anchor Member (AM)
  SELECT nodeid, nodetype, parentid, 0
  FROM treeview
  WHERE nodeid = 1
  UNION ALL
    
  -- Recursive Member (RM)
  SELECT E.nodeid, E.parentid, E.nodetype, M.lvl+1
  FROM treeview AS E
    JOIN EmpCTE AS M
      ON E.parentid = M.nodeid where e.nodetype='Folder'
)
SELECT * FROM EmpCTE