public static string Build(IEnumerable<LabelInfo> labels)
    {
      using (var writer = new StringWriterWithEncoding(Encoding.Default))
      {
        foreach(var labelInfo in labels)
        {
          writer.WriteLine(string.Format("{0}\t{1}}\t{2}\t{3}\t{4}\t{5}\t{6}\t{7}\t{8}",
                            labelInfo.FirstName ,
                            labelInfo.LastName ,
                            labelInfo.CorpName,
                            labelInfo.Address,
                            labelInfo.PostalCode ,
                            labelInfo.City,
                            labelInfo.State ,
                            labelInfo.IsoCountryCode ,
                            labelInfo));
        }
      }
      
      var content = writer.GetStringBuilder().ToString();

      return content;
    }