private void PollRoomUsers_NewUsers(object sender, ProgressChangedEventArgs e)
        {
            if (!(e.UserState is TeamRoomUsers))
            {
                return;
            }

            TeamRoomUsers users = e.UserState as TeamRoomUsers;

            LoadRoomUsers(users);
        }
        private void LoadRoomUsers(TeamRoomUsers roomUsers)
        {
            if ((teamRoom != null && roomUsers.RoomId != teamRoom.Id) || roomUsers.ConnectionUri != projectCollectionUri)
            {
                return;
            }

            RoomUsers.Clear();

            if (roomUsers.Users != null)
            {
                foreach (var item in roomUsers.Users.Where(x => x.IsOnline))
                {
                    if (!UserWorker.Instance.ProfileImages.ContainsKey(item.UserRef.Id))
                    {
                        var profileImages = TfsServiceWrapper.GetUserProfileImages(new List <IdentityRef> {
                            item.UserRef
                        });
                        UserWorker.Instance.GetProfiles(profileImages);
                    }
                    RoomUsers.Add(item);
                }
            }
        }