Which is best for data store Struct/Classes?

Question

We have seen lots of discussion in SO regarding the class vs struct in c#. Mostly ended with conclusions saying its a heap/stack memory allocation. And reco

Answer 1

The comment about structs being immutable is correct. And this is where it can bite you. You can define structs with field setters, but when you change a field value a new instance is created. So if you hold a reference to the old object it will still reference the old value. I don't like using mutable stucts for this reason as this can produce subtle and complex bugs (especially if you use complex compound statements).

On the other hand, there are lots of good reasons for using classes with immutable state also (think string).