数据库中的一些数据更改。如何触发一些C＃代码在这些更改上做一些工作？

Suppose I have some application A with a database. Now I want to add another application B, which should keep track of the database changes of application A. Application B should do some calculations, when data has changed. There is no direct communication between both applications. Both can only see the database.Suppose I have some application A with a databa