Enforcing Database Constraints In Application Code

Question

I\'m working on my first real asp.net web application and I\'m kind of stumped on the best place and method to trap and handle database constraint violations. Suppose I hav

Answer 1

I agree that it is the latter given your description of how you are using the database. It is really important to realize that even if you made a call from your business layer to validate every single possible constrain violation before doing an update/insert, a split second later the database state could change because of requests of other users and your update/insert could still fail.