When you call a method that has a reference parameter, you must also write the keyword ref before the argument.

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Quizplus · Accepted Answer

This is true. When calling a method that has a reference parameter, you must use the keyword "ref" before the argument to indicate that you want to pass the argument by reference. This allows the method to modify the argument and have that modification reflected in the calling method.

When You Call a Method That Has a Reference Parameter