public async void QueueUrl(QueueUrl qurl)
        {
            Console.WriteLine("[Downloadanager] QueueUrl");
            Console.WriteLine("[Downloadanager] QueueUrl Url         : {0}", qurl.Url);
            Console.WriteLine("[Downloadanager] QueueUrl Description : {0}", qurl.Description);

            string   url         = qurl.Url;
            string   description = qurl.Description;
            Download result      = null;
            bool     exists      = _repo.TryByUrl(url, out result);

            if (exists)
            {
                await _bus.SendAsync <NotifyProgress> (new NotifyProgress {
                    Url      = result.Url,
                    Download = result
                });

                await _bus.SendAsync <AlreadyQueued> (new AlreadyQueued {
                    Url = url
                });

                return;
            }

            var insert = new Bo.Download {
                State            = Bo.State.Waiting,
                Url              = url,
                ErrorDescription = description,
                Written          = 0,
                Total            = 0
            };

            _repo.Insert(insert);
            await _bus.SendAsync <CheckFreeSlot> (new CheckFreeSlot());

            await _bus.SendAsync <NotifyProgress> (new NotifyProgress {
                Url      = insert.Url,
                Download = insert
            });

            return;
        }