Delete multiple rows in ASP.Net Nested Gridview control using CheckBoxes

Hello Mudassar,

I have trying your solution (http://www.aspsnippets.com/Articles/Bulk-delete-multiple-rows-in-ASPNet-Gridview-control-using-CheckBoxes.aspx). in nested grid view. But it is not working with nested grid view. Can you please tell me how to solve it.

Error "object reference not set to an instance of an object"

Thanks

Vicky