private IEnumerable <ParticipantResponseViewModel> FilteredGroupParticipants(string currentUserId)
{
return(AllConnectedParticipants.ToList()
.Where(p => p.Participant.ParticipantType == ChatParticipantTypeEnum.User ||
AllGroupParticipants.Any(g => g.Id == p.Participant.Id && g.ChattingTo.Any(u => u.Id == currentUserId))
));
}