Chalenging Doubt in dataGrid

[mahivr]

im using datagrid for reporting.

I have some problem in displaying data's

In this report im using ResNub# field
1. there is some records with duplication of ResNub# pls ref fig (i)
2. in this situation, i want to identify duplication and want to amake that data as Hyperlink.
3. If i click that link other duplication record should be displayed below that row. pls ref fig(ii)


Any one know abt this concept? how to acheive this in ASP.NET?

Thanks