Treeview question

I have a treeview on a web page.  I have a flat file that contains the heirarchy of the treeview.  Here is an example of the flat file:

Element       Parent

1                 blank

A                 1

B                 A

C                 B

D                B

2                1

F                2

G               2

H               F

I                G

So I want my treeview to look like this:

1

  +A

        +B

            C

            D

  +2

        +F

             H

         +G

             I 

So "1" is the root and all parents will fall under this root.  I then want all nodes to be built dynamically as I read thru this flat file.  But I'm not sure how to do this or if it's even possible.  Can anyone help?