Hi,
Try this link if could help.
Need to add All to the dropdownlist in the below.
To insert the ----select---- at the top of you dropdown list,
please see example above:
dphaircolor.Items.Insert(0,new ListItem("All", "All")); // Insert All at top selection
In manipulation of your group, I think you could be handle it with
your SQL where clause
Regards,
Algem