Hi,
rpreethi:If i do something in the child form, itz again loading the page and it will show only the parent in the tree view
my problem is :itz not showing the parent and child
Did you place the treeview is a single page?
I would suggest that you can create a master page and place the treeivew on the master page, then make all the page refer the master page, then you can see the treeview on the any page.
About the master page, you can refer this link: http://www.odetocode.com/Articles/419.aspx
If I misunderstand you, please let me know.