Hello,
you cannot use MergeOption with DbContext API. The only available replacement is AsNoTracking extension method for IQueryable with the same meaning as MergeOption.NoTracking. If you want full power of MergeOption you must convert your DbContext to ObjectContext
and use ObejctSet and ObjectQuery instead:
ObjectContext context = ((IObjectContextAdapter)dbContext).ObjectContext;
ObjectSet<YourEntity> set = objectContext.CreateObjectSet<YourEntity>();
set.MergeOption = ...;
// Now run the query from the set
Best regards,
Ladislav