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

Struct can be used to improve garbage collection performance. While you usually don't have to worry about GC performance, there are scenarios where it can be a killer. Like large caches in low latency applications. See this post for an example:

http://00sharp.wordpress.com/2013/07/03/a-case-for-the-struct/