Bind 2 tables in an editable asp.net gridview & bulk update

Question

Scenarios:

I have two tables table A and Table B. table A has 5 columns and table B has 3 columns. Column A1 and B1 are a foreign key/reference column

Column A1 from table A to be bound as editable text field , Column B2 is a check box , B3 to be bound as editable text field

 

lets assume we have 10 rows bounded to a gridview. On clicking of edit we should update each row respectively. I had updated Row 1,5 and 7. So we should send only these 3 rows to a database through a datatable on clicking of save button which is placed under the gridview