public MessageHub(IMessageService messageService,
                   MessageEventHandlerBase eventHandler,
                   IHubGroupManager <string> groupManager)
 {
     _messageService = messageService;
     _eventHandler   = eventHandler;
     _groupManager   = groupManager;
 }
 public GroupViewerHub(IHubGroupManager <string> HubManager)
 {
     _groupManager = HubManager;
 }