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// Passing ref-types by ref.

Console.WriteLine("\n***** Passing Person object by reference *****");

Person mel = new Person("Mel", 23);

Console.WriteLine("Before by ref call, Person is:");

mel.Display();

SendAPersonByReference(ref mel);

Console.WriteLine("After by ref call, Person is:");

mel.Display();

Console.ReadLine();

}

Figure 4-14.

Passing reference types by reference allows the reference to be redirected.

As you can see, an object named Mel returns after the call as a type named Nikki, as the

method was able to change what the incoming reference pointed to in memory. The golden rule to

keep in mind when passing reference types:

• If a reference type is passed by reference, the callee may change the values of the object’s

state data as well as the object it is referencing.

• If a reference type is passed by value, the callee may change the values of the object’s state

data but not the object it is referencing.