对DataGrid中的ListBox设置值

   if ( e.Item.ItemType == ListItemType.EditItem )
   {
    DataRowView drv = (DataRowView)e.Item.DataItem;

    SqlCommand com = new SqlCommand("select dm,dmmc from zy_yp1_group order by dmmc");
    com.Connection = conn;
    if (conn.State != ConnectionState.Open )
     conn.Open();
    SqlDataReader dr = com.ExecuteReader();

    ListBox lb = (ListBox) e.Item.Cells[11].Controls[1];
    lb.DataSource = dr;
    lb.DataTextField = "dmmc";
    lb.DataValueField = "dm";
    lb.DataBind();

    dr.Close();
    conn.Close();
   }