var itemSet = from item in da.GetList<Models.account>()
                           join file in objFileStorageList
                           on item.account_id equals file.parent_id into objFile
                           from fileItem in objFile.DefaultIfEmpty()
                           where item.company != null && item.company.company_id == 123
                           orderby item.updatedDate descending
                           select
                           new
                           {
                               Id = item.account_id,
                               RefNo = item.refNo,
                               StartDate = item.StartDate ,
                               EndDate = item.EndDate ,
                               Comment = item.comment,
                               FileStorageID = fileItem != null ? fileItem.fileStorage_id : -1,
                               Identification = fileItem != null ? fileItem.identifier : null,
                               fileName = fileItem != null ? fileItem.file_nm : null
                           };

It raises error message when I try to enumerate through collection result from Linq query above.

LINQ to Entities does not recognize the method 'System.Collections.Generic.IEnumerable1[SCEFramework.Models.fileStorage] DefaultIfEmpty[fileStorage](System.Collections.Generic.IEnumerable1[SCEFramework.Models.fileStorage])' method, and this method cannot be translated into a store expression

foreach (var item in itemSet)
        {
            string itemRef=  item.RefNo;    
        }

Please suggest me any solutions. Thanks in advance.