I have to develop a time sheet application for my organization, where
employees will select the nature of work, enter client details (into
textbox
inside grid) and other details and enter the number of hours spent.

In that, while selecting clients I have to show them a pop window which
again will have grid showing client address, name and other details. From
the
pop up window employee will select a client. After that that client name
and
address has to populate to the grid in the parent window.

Please let me know what is the best way to do this?

Can I use gridview for this or is there any best solution for this?