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Message: [QUOTE="jmcilhinney, post: 4720, member: 3"] The rules about when to use `out` and `ref` are very simple: If you want to use a parameter only to pass a value or object out of a method then use `out`. If you want to pass in one value or object and pass out another then use `ref`. If you want to be able to modify an existing value type inside the method and have that change affect the original value then use `ref`. In all other cases, use the default mechanism, which is passing by value. That is all you have to consider. Only value type objects get copied when passed by value and that should never be an issue because you should be following Microsoft's recommendation that value types should only ever be 16 bytes or smaller. [/QUOTE]