The Definitive "Passing Data Between Forms"

[kleinma]

Though strings are reference types in .NET, they don't quite behave as such.
Instead they behave more like value types rather than reference types. They are mutable. One string can't change the contents of another string even if they are pointing to the same memory location. As soon as you try to do that, .NET will create a new memory location and make it point there.

you are correct. To be honest, I am not sure why I said that originally (was 2 years ago). Although one thing to note is strings are actually immutable, not mutable.