c# sql express database update problem

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C#

SQL

Hi all;

I am working on visual studio 2010 and sql express database.
I have 3 tables in database, these are;

1. ehs_A columns are id_A, name (id has primary key and auto increment)

2. ehs_B columns are id_B, age (id has primary key and auto increment)

3. ehs_main columns are id_Main, id_A, id_B (id_Main has primary key and auto increment)(id_A, id_B is other tables primery keys)

how can i update the main table when i insert data to other tables.

Best Regards
Aykut