Tree View problem, can anyone have idea about the logic?

[zzz]

a text file inside: (**those line are not sort, it is random**):

aaa (number 1)
bbb (number 2, reference 1)
ccc (number 3, reference 2)
ddd (number 4, reference 2)
eeee (number 5, reference 4)
ffff (number 6)
ooo (number 7)
ggg (number 8, reference 6)
qqq (number 9, reference 8)
zzz(bumber 10, referebce 1)
---------------------------------------------------------------------------

when I **readLine()** from this file to end

what way I can make to a tree view ???

tree view
+aaa
|---------bbb
| |-----------ccc
| |-----------ddd
| |--------eee
|--------zzz

ooo
fff
|---------ggg
|----------qqq

like the newsgroup articles is follow the reference number to build to tree
example,
the code:

tld one = new tld();
one.text = eee;

tld two= new tld(();
two.text = ddd;

tld three = new tld();
three.text = ccc
tld four = new tld()
four.text = zzz

two.Nodes.add (three);
one.Nodes.add(two);
one.Nodes.add(four);

makes:

+eee
|-----ddd
| +------ccc
|-----zzz
THANKS