public string GenerateCodes()
{
Random random = new Random();
DateTime timeValue = DateTime.MinValue;
// Create 10 codes just to see the random generation.
int rand = random.Next(3600) + 1; // add one to avoid 0 result.
timeValue = timeValue.AddMinutes(rand);
byte[] b = System.BitConverter.GetBytes(timeValue.Ticks);
string voucherCode = Transcoder.Base32Encode(b);
string code = string.Format("{0}-{1}-{2}",
voucherCode.Substring(0, 4),
voucherCode.Substring(4, 4),
voucherCode.Substring(8, 5));
return(code);
}