save data in database

Question

i have a gridview in ASP.net which have two columns. in every row of that gridview first colmn contain some parent_user name which is stored already in database table and second column contain another gridvew. in second gridview first column contain checkbox and second column contain attribute of parent_user and othher 2 or three column contain dropdownlist. for selected attribute of parent_user which is done by click on checkbox i want to save the entire row of second gridview with the parent_user name into database table. The database is SQL Server. How can I do that?