private async void limparConversas(object sender, RoutedEventArgs e)
{
MessengerRepository mr = await DbFunctions.obtem_conexao_bd();
List <Messenger> messengers = await mr.SelectAllMessengerAsync();
await Task.Delay(TimeSpan.FromSeconds(1));
foreach (var item in messengers)
{
await mr.DeleteMessengerAsync(item);
}
await Task.Delay(TimeSpan.FromSeconds(1));
await new MessageDialog("Excluindo Conversa!").ShowAsync();
GC.SuppressFinalize(mr);
}
