IQueryable<PurchaseOrderDTO> query =  context.PurchaseOrder;
query = query.Where(x => x.CreateDate.Date >= purchaseOrderSearchParameters.CreatedDateFrom.Value.Date);
return query.ToList();

IQueryable<PurchaseOrderDTO> query =  context.PurchaseOrder;
query = query.Where(x => System.Data.Entity.DbFunctions.TruncateTime(x.CreateDate) >= purchaseOrderSearchParameters.CreatedDateFrom);
return query.ToList();