How to do this:
Turnthisover:
The only thing I can imagine is putting a treeview inside the gridview, even then, I do not even know if that's possible.
Doubt is just about the same functional part, the aesthetic part I'm going to do once I've solved it.
With the gridview of webforms it will be punk, I once did with it formatted using DataTables.net but it is not so easy if you have to show a lot of data on the child line or use the devexpress gridview despite being paid is quite easy to use.
URL of the Datatable.net free jquery plugin that can be your solution. link
