public void AddGroupUsers(WfGroup group, IEnumerable <IUser> users) { group.NullCheck("group"); users.NullCheck("users"); WfGroupUserCollection groupUsers = new WfGroupUserCollection(); foreach (IUser user in users) { WfGroupUser gu = new WfGroupUser(); gu.GroupID = group.GroupID; gu.User = user; groupUsers.Add(gu); } InsertGroupUsers(groupUsers); }