Can you suggest me some idea how to achieve this

My requirement is i have to enter company details and that particular company contact details..

Company and contact details should be saved at once in 2 different tables.

I am using a gridview to enter multiple  contact details.. For which i am using a empty data template and when the user wants to update the company details he should at that time also be able to add a new contact person details.. How do i do this?