Add Listview group thru code

Dear All,

How to add listview group thru code? .. I am trying codes below.. but nothing appear on my lv (listview)..

Code:

---

while (dr.Read())
{
    string groupname = dr.GetString(dr.GetOrdinal("groupname"));
    lv.Groups.Add(new ListViewGroup(groupname, HorizontalAlignment.Center));
}

---

could anybody please help?

Thanks & Regards

Do you have the ShowGroups property set to true?

yes, ShowGroups property is True by default..

any idea?