datalist itemcommand for cancel c#

protected void datalist_id_ItemCommand(object source, DataListCommandEventArgs e)
    {
        if (e.CommandName.ToString() == "cancel")
        {
            datalist_id.EditItemIndex = -1;

            DataSet ds = my_db.sqlpuldata("select * from tbl_url order by url_id desc");
            datalist_id.DataSource = ds;
            datalist_id.DataBind();
        }