When should I use a struct rather than a class in C#?

Question

When should you use struct and not class in C#? My conceptual model is that structs are used in times when the item is merely a collection of value types. A way to

Answer 1

I do not agree with the rules given in the original post. Here are my rules:

1) You use structs for performance when stored in arrays. (see also When are structs the answer?)

2) You need them in code passing structured data to/from C/C++

3) Do not use structs unless you need them:

• They behave different from "normal objects" (reference types) under assignment and when passing as arguments, which can lead to unexpected behavior; this is particularly dangerous if the person looking at the code does not know they are dealing with a struct.
• They cannot be inherited.
• Passing structs as arguments is more expensive than classes.