public void AddLine(int parentID, HeadDTO headDTO) {

            Head line = new Head();
            line.Description = headDTO.Description;
            line.Min = headDTO.Min;
            line.Exp = headDTO.Exp;
            line.Max = headDTO.Max;
            line.Median = ((line.Min + (3 * line.Exp) + line.Max) / 5.0);
            line.StdDev = (line.Max - line.Min) / 5;
            line.PValue = Math.Pow((double)line.StdDev, 2);
            line.IsLine = parentID;
            line.Owner = headDTO.Owner;
            line.TeamId = headDTO.TeamId;
            try {
                db.Heads.InsertOnSubmit(line);
                db.SubmitChanges();
            } catch { } /*what error??*/
            UpdateParent(GetHeadDetails(parentID));

        }