Is string a value type or a reference type?

by 
Console.WriteLine(typeof(string).IsClass); // true

It’s a reference type.

It can’t be a value-type, as value-types need a known size for the stack etc. As a reference-type, the size of the reference is known in advance, even if the size of the string isn’t.

It behaves like you expect a value-type to behave because it is immutable; i.e. it doesn’t* change once created. But there are lots of other immutable reference-types. Delegate instances, for example.

*=except for inside StringBuilder, but you never see it while it is doing this…

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