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Handle SQLExceptions in Data Access Layer and pass error to the View(user)

MSFanboy asked
Last Modified: 2012-05-10

I would like to know what is the best practice in this case:

Customer`s firstname + lastname has a unique index so if I do insert the same name again I get a constraint exception (update exception). in my Repository. What is no the best way to show a user a message box saying update failed because customer already exists?

Do the InserCustomer with a return code like

In my presenter/viewmodel
int updateStatus = repository.CreateCustomer()

if(updateStatus == -1)
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