Where to run a duplicate check for an entity

Question

I\'m looking for advice on the \"best\" place to put validation logic, such as a duplicate check for an entity, when using Entity Framework Code-First, in an MVC application

Answer 1

The most reliable place to perform this logic would be the database itself by declaring an unique field constraint on the name column. When someone attempts to insert or update an existing entity and try to set its name to an existing name a constraint violation exception will be thrown that you could catch and interpret in your data access layer.