public ChangePhotoResponse ChangePhoto(ISession session, ChangePhotoRequest request)
        {
            var response = request.CreateResponse<ChangePhotoResponse>();
            response.Success = true;
            int photoId = request.BuiltinPhotoId;
            if (!request.PhotoData.IsNullOrEmpty() && request.PhotoData.Length > 10)
            {
                try
                {
                    photoId = _fileStorage.AppendFile(request.PhotoData);
                }
                catch (Exception exc)
                {
                    photoId = 0;
                    response.Success = false;
                }
            }
            response.PhotoId = photoId;

            if (response.Success)
            {
                using (var uow = UnitOfWorkFactory.Create())
                {
                    uow.Attach(session.User);
                    session.User.ChangePhoto(photoId);

                    uow.Commit();
                }
                _profileChangesNotificator.NotifyEverybodyInChatAboutProfileChanges(session.User.Id, new Dictionary<string, object> { { "PhotoId", photoId } });
            }

            return response;
        }
		public Task<ChangePhotoResponse> ChangePhoto(ChangePhotoRequest request)
		{
			return ConnectionManager.SendRequestAndWaitResponse<ChangePhotoResponse>(request);
		}