public async Task <ChatConversation> SendMessageToChat(string appId, string chatId, string userId, string message) { var user = await _userRepository.GetAsync(appId, userId); var chat = await _chatRepository.GetAsync(appId, chatId); if (chat != null) { var chatConversation = new ChatConversation() { Id = ObjectId.GenerateNewId().ToString(), UserId = user.Id, Date = DateTime.Now, Text = message, ChatConversationReaders = new List <ChatConversationReader> (), User = new User() { Id = user.Id, FullName = user.FullName } }; await _chatRepository.AddMessageToChatAsync(chatId, chatConversation); return(chatConversation); } return(null); }