public async Task FillAsync()
        {
            DialogsService   = _ioc.Resolve <IDialogsService>();
            SendingService   = _ioc.Resolve <ISendingService>();
            ContactsService  = _ioc.Resolve <IContactsService>();
            ReceivingService = _ioc.Resolve <IReceivingService>();
            ReceivingService.OnUpdateDialogs  += ReceivingService_OnUpdateDialogs;
            ReceivingService.OnUpdateContacts += ReceivingService_OnUpdateContacts;

            await ContactsService.FillContacts();

            await DialogsService.FillDialogList();
        }
 private void ReceivingService_OnUpdateContacts()
 {
     ContactsService.FillContacts();
 }