public async Task DeleteNotifications( XCollection<Notification> notifications, CancellationToken cancellationToken )
		{
			var exits = await RefreshNotifications( cancellationToken );

			var newcollection = new XCollection<Notification>();
			foreach (var notification in exits)
			{
				if (notifications.All( x => x.NotifiedPerson != notification.NotifiedPerson ))
				{
					newcollection.Add( notification );
				}
			}

			var authors = new List<string>();
			foreach (var notification in newcollection)
			{
				if (!string.IsNullOrEmpty( notification.NotifiedPerson ))
				{
					authors.Add( notification.NotifiedPerson );
				}				
			}

			string authorsString = string.Join( "||", authors );

			XCollection<Notification> result;

			Dictionary<string, object> parameters;
			if( string.IsNullOrEmpty( authorsString ) )
			{
				if( exits.Count > 0 )
				{
                    for (int i = notifications.Count - 1; i >= 0; i--)
                    {
                        var notif = exits.FirstOrDefault(x => x.NotifiedPerson == notifications[i].NotifiedPerson);
                        if (notif != null) exits.Remove(notif);
                    }

                    string newAuthorsString = string.Join("||", exits);

                    parameters = new Dictionary<string, object>
					{							
						{ "update_subscr", newAuthorsString }								
					};

					result = (await _client.Subscriptions( parameters, cancellationToken )).Notifications;

                    //parameters = new Dictionary<string, object>
                    //{							
                    //    { "del_subscr", exits[0].NotifiedPerson }								
                    //};

                    //result = ( await _client.Subscriptions( parameters, cancellationToken ) ).Notifications;
				}
				else
				{
					result = new XCollection<Notification>();
				}
			}
			else
			{
				parameters = new Dictionary<string, object>
					{							
						{ "update_subscr", authorsString }								
					};

				result = (await _client.Subscriptions( parameters, cancellationToken )).Notifications;
			}

			UpdateNotificationList( result, cancellationToken );
		}