Tree-/Gridcontrol for ASP .Net

[Schaflitzel]

I need a ASP .Net datagrid control with tree-like properties.

More precisely: I have a tree structure. For every node of the tree there is a row. For every data column the entry belonging to a node is just the sum of the entries
of the childs if the node has childs. Otherwise the entry comes from a data base. The usual operations on the tree should be performant.

Which free or commercial products can help to build such a control?

Thank you.

[MRutledge]

use the IE Tree Web Control from microsoft. The IE Web controls are free to download from microsoft. This will give you all the properties of a tree.