A Nested-GridView is a GridView control inside the grid row of the parent GridView control.
| gvParent | It is a parent gridview control which contains a child gridview like gvChild control and other controls in gridview row like Labels, Buttons etc. |
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| gvChild | It is a child gridview control that can also contain some other controls like in parent gridview. It will be nested in gvParent gridview control. |
Parent gridview can be bind using a simple DataBind function like gvParent.DataBind();. And for binding Child gridview, you have to bind it in OnRowDataBound event of parent gridview.