You are implementing an application that uses Entity Framework-generated entities to update a data source. You add a method that retrieves a Product entity, modifies it, and then calls the ObjectContext's SaveChanges method. You configure the Entity Data Model to check for concurrency before updating the data source. You need to log the error if the data source cannot be updated because the concurrency check fails.

What should you do?

By default, the Entity Framework implements an optimistic concurrency model. You can define a property in the Entity Data Model's conceptual layer and set the ConcurrencyMode attribute to "Fixed". This will ensure that concurrency is checked. If the concurrency check fails when you call the SaveChanges method, SaveChanges will throw the OptimisticConcurrencyException. Handle this exception to detect concurrency failures.

The SaveChanges method will throw an OptimisticConcurrencyException, not a SqlException, if the concurrency check fails.