/// <summary>
        /// Efficient pageing for grid.
        /// </summary>
        /// <param name="pageNumber">Must be greater than zero.</param>
        /// <param name="sortDirection">Validne vrijednosti su 'asc' i 'desc'.</param>
        public static EntityCollection <PartnerEntity> FetchPartnerCollectionForPaging(DataAccessAdapterBase adapter,
                                                                                       RelationPredicateBucket bucket,
                                                                                       PrefetchPath2 prefetchPath,
                                                                                       int pageNumber,
                                                                                       int pageSize,
                                                                                       string sortField,
                                                                                       bool isSortAscending)
        {
            string sortDirection = isSortAscending ? "asc" : "desc";

            Type   sortEntityFieldType     = typeof(PartnerFields);
            string sortEntityFieldTypeName = SortHelper.GetEntityFieldTypeNameForSorting(sortField, sortEntityFieldType);

            if (!string.IsNullOrWhiteSpace(sortEntityFieldTypeName))
            {
                sortEntityFieldType = Type.GetType(sortEntityFieldTypeName);
            }

            sortField = SortHelper.GetSortField(sortField);

            SortExpression sort = SortHelper.GetSortExpression(sortField, sortDirection, sortEntityFieldType);

            EntityCollection <PartnerEntity> toReturn = new EntityCollection <PartnerEntity>(new PartnerEntityFactory());

            adapter.FetchEntityCollection(toReturn, bucket, pageSize, sort, prefetchPath, pageNumber, pageSize);

            return(toReturn);
        }