Load treelistview from datasource with hardcoded root nodes on treelistview

Hi,
.
Could you please provide me a code sample showing how to load a treelistview from database with hardcoded root nodes on treelistview.

I have attached a sample preview of the tree I am in need of. Rootnodes are hardcoded and I want the child nodes to be populated from a database.

Please shed some light here.

Thanks
Rahul