从其他表mvc .net验证后从表中获取数据

Question

我在实体框架中工作。问题是我想从表A（AssetTransactions）获得那些与表B的属性LoggedInMonth（ReopeningValidations）不匹配的事务。请给我一个想法或替代查询

from transaction in dbContext.AssetsTransctions join validation on 
dbContext.Reopening Validations on transaction.TransId equals 
validation.AssetTransaction_TransId 
where ((transaction.PurchaseDate <= pDAte && 
transaction.IsAvailable.Equals(true)) && 
(!(validation.LoggedInMonth.Equals(loggedMonthYear)))) select transaction