Question

How can I force rollback the SaveChanges() method even if it succeeds ?

Answer 1

You’ll need to wrap it into a transaction scope, and then dispose of it without completing the scope.

using (var scope = new TransactionScope( TransactionScopeOption.Required, System.TimeSpan.MaxValue ))
{
  /* your code goes here */
}

If you want to actually save the changes call scope.Complete()

See this MSDN post for more information.