private void _loadUnderRdoUnitGroup()
 {
     ProcessUserWiseUnitCat _prounitgroup = new ProcessUserWiseUnitCat();
     lstBT.Items.Clear();
     lstNBT.Items.Clear();
     try
     {
         _prounitgroup.UserID = int.Parse(_ddlUser.SelectedValue);
         _prounitgroup.ComID = int.Parse(Session["trkCompany"].ToString());
         _prounitgroup.fillListedUnitGroups(lstBT);
         _prounitgroup.fillNotListedUnitGroups(lstNBT);
     }
     catch (Exception ex)
     {
         ex.Message.ToString();
     }
     finally
     {
         _prounitgroup = null;
     }
 }