Nested Gridview with child grid editable

Hi all,
Please suggest me some links on:
Requeriment: ASP.NET
A nested gridview with only one column editable mode and with checkbox both inside child grid.
I have 2 button control "Edit" and "Update" on clicking edit button the gridview should be enabled. i need to edit 2 -3 columns values  of child grid on clicking checkbox.
after editing values of only checked row of child grid i ll click update button and the data should be updated to database.



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