Publication pub = tdse.GetPublication(publicationUri);
            ListRowFilter rowFilter = tdse.CreateListRowFilter();
            rowFilter.SetCondition("ItemType", ItemType.ItemTypeCategory | ItemType.ItemTypeKeyword);
            rowFilter.SetCondition("Recursive", true);

            catandkeyList.LoadXml(pub.GetListItems(ListColumnFilter.XMLListDefault, rowFilter));
            catandkeyList.Save(Server.MapPath("Keyworddetails.xml"));

rowFilter.SetCondition("ItemType", ItemType.ItemTypeCategory | ItemType.ItemTypeKeyword);