事务(进程ID 56)在锁上死锁

这里我使用的是Linq到sql，我的表中有30000多行。

我使用以下查询从数据库中提取记录：

IEnumerable<DealsDetails> DD = (from D in DealDbContext1.Deals
                                            where D.Address == City && (D.DealTime >= DateTime.Now || D.DealTime == dealcheck) && PriceMax >= D.DealPrice && D.DealPrice >= PriceMin && DisCountMax >= D.SavingsRate && D.SavingsRate >= DiscountMin && (D.DealTime >= DateTime.Now.AddDays(TimeMin) && D.DealTime <= DateTime.Now.AddDays(TimeMax) || D.DealTime == dealcheck)
                                            select new DealsDetails(
                                                lst,
                                                D.DealId,
                                                D.DealHeadline,
                                                D.DealCategory,
                                                D.BuyPrice,
                                                D.DealPrice,
                                                D.SavingsRate,
                                                D.SavingAmount,
                                                D.RelatedWebsite,
                                                D.Address,
                                                string.Empty,
                                                D.DealImage,
                                                string.Empty,
                                                string.Empty,
                                                D.Time, D.CurrentTime, D.DealTime,
                                               D.Location, string.Empty, string.Empty, D.Latitude, D.Longitude, D.Islocal, D.VendorMail, D.MerchantInfo, D.Review, D.HowItWork, D.DealUrl
                                                ));

if (lstSite.Count > 0 && lstSite[0] != "AllDeals")
                {
                    DD = DD.Where(D => D.RelatedWebsite.Split(',').Where(x => lstSite.Contains(x)).Any()); //.Where(row => row.Category.ToList().Where(x => lst.Contains(x)).Any()).ToList();
            }

某段时间我的查询成功运行，或者某段时间出现错误：事务（进程ID 56）在与另一个进程的锁|通信缓冲区资源上死锁，已被选为死锁牺牲品。重新运行事务。

提前感谢。。。