gistfile1.txt

private async void ConfigurateLogger()
        {
            StorageFolder logsFolder = null;
            try
            {
                logsFolder = await ApplicationData.Current.LocalFolder.GetFolderAsync("Logs");
            }
            catch (Exception)
            {
            }

            if (logsFolder == null)
            {
                logsFolder = await ApplicationData.Current.LocalFolder.CreateFolderAsync("Logs");
                var file = await logsFolder.CreateFileAsync("Log.txt", 
                    CreationCollisionOption.ReplaceExisting);
                using (var stream = await file.OpenStreamForWriteAsync())
                {
                    Log.Logger = new LoggerConfiguration().WriteTo
                        .TextWriter(new StreamWriter(stream))
                        .CreateLogger();
                }
            }
        }