User61956409 posted
Hi thepast,
You can put the GridView in the ItemTemplate of TemplateField of parent GridView, and on the
RowDataBound event of the parent GridView, you can find the child GridView from current data row and dynamically populate it with data source.
This article explained with an example, how to build Nested GridViews with Expand and Collapse feature, please
refer to it.
With Regards,
Fei Han