Anyone know how to use Distinct() with Group By? I tried the following with no luck..

            var q = from i in MetaData.ProcessRoundIssueInstance
                    group i by i.GroupID into g
                    select new
                    {
                        Group = g.Key,
                        UniqueUsers = g.Select(x => x.UserID).Distinct().Count()
                    };

Thanks!

What is the SQL you are trying to reproduce?