When you use either the ref or out keywords before an array parameter, the receiving method does not automatically make a local copy of the array.

Name: When you use either the ref or out keywords before an array parameter, the receiving method does not automatically make a local copy of the array.
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When you use the ref or out keywords before an array parameter, the receiving method operates on the original array object rather than a local copy of the array.

When You Use Either the Ref or Out Keywords Before