OptimisticConcurrencyException Does Not Work in Entity Framework In Certain Situations

Question

UPDATE (2010-12-21): Completely rewrote this question based on tests that I\'ve been doing. Also, this used to be a POCO specific question, but it turns out that my

Answer 1

Here is another approach that is a bit more generic and fits in the data layer:

// if any timestamps have changed, throw concurrency exception
var changed = this.ChangeTracker.Entries<>()
    .Any(x => !x.CurrentValues.GetValue("Timestamp").SequenceEqual(
        x.OriginalValues.GetValue("Timestamp")));
if (changed) throw new OptimisticConcurrencyException();
this.SaveChanges();

It just checks to see if the TimeStamp has changed and throws concurrency exception.