public void SendNotification(string username)
        {
            var msg = string.Empty;

            if (username == webHelper.GetUserName())
            {
                msg = "You cannot sent invitation to yourself!";
            }
            else
            {
                var isSucces = this.invitationService.AddInvitation(username, webHelper.GetHouseholdIdFromCookie());

                if (isSucces)
                {
                    Clients.User(username).addNotification();
                    msg = "Invitation was sent.";
                }
                else
                {
                    msg = "Invitation was previously sent or user is already in this household!";
                }
            }

            var connId = Context.ConnectionId;

            Clients.Client(connId).addMessage(msg);
        }