Mimicking SQL Insert Trigger with LINQ-to-SQL?

If you want it to happen just before it is saved; you can override SubmitChanges and call GetChangeSet() to get the pending changes. Look for the things you are interested in (for example delta.Inserts.OfType() and make your required changes.

The Add method only sets up a link between the two objects: it doesn't mark the added item for insertion into the database. For that, you need call InsertOnSubmit on the Table instance contained within your DataContext. The trouble, of course, is that there's no innate way to access your DataContext from the method you describe.

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