Linq hierarchical update w/ TableAdapterManager

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I am trying to use Update to save changes made on two DataGridView's to two
tables with a FK relationship. I say

private void bUpdate_Click(o bject sender, EventArgs e) {
try {

CustomerDataSet TableAdapters.T ableAdapterMana ger taManager = new
CustomerDataSet TableAdapters.T ableAdapterMana ger();
taManager.Conne ction = postsTableAdapt er.Connection; // or should it be
// =
postDetailsTabl eAdapter.Connec tion ??
taManager.Posts TableAdapter = postsTableAdapt er;
taManager.PostD etailsTableAdap ter = postDetailsTabl eAdapter;
taManager.Updat eAll(customerDa taSet);
}
catch (System.Excepti on ex) {
MessageBox.Show (ex.Message.ToS tring());
}

}


It doesn't work (DataGridView changes are not saved to the database. Also:
it doen't raise an exception).

Can you help?

Thanks