How to create ForeignKeyConstraint?

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Hello,
I am a newbye, and I'm trying to write a simple application.
I have five tables with three columns; all tables are identical; I need to
change some data in the first table and let VB updates the same data in all
other four tables in the right places.
I know it would be possible by using the ForeignKeyConstraint object. I have
created the tables using the DataSet Visual Tool and I know it doesn't
create any ForeignKeyConstraint obj. I have found many codes examples on it,
but I don't know how to merge the code they in an existing dataset.

Hope somebody help.
Thanks in advance,
Max.



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