For use on blog post: http://www.normansolutions.co.uk/post/creating-a-firefly-online-users-feature

OnlineUsersSection2.cs

if (myReader.Read())
  {
    while (myReader.Read())
      {
        DateTime loggedDate = Convert.ToDateTime(myReader["date"].ToString());
        if (loggedDate.AddMinutes(5) >= DateTime.Now)
          {
            if (!checkForDup.Contains(myReader["Online"].ToString()))
              {
                if (count < 10)
                  {
                    sb.Append("{\"user\":\"" + myReader["Online"].ToString() + "\",\"guid\":\"" + myReader["guid"].ToString() + "\",\"logged\":\"" + loggedDate.TimeOfDay.ToString() + "\"},");
                    checkForDup.Add(myReader["Online"].ToString());
                    count++;
                  }
              }
          }
      }
  }
else
  {
    sb.Append("");
  }