C# Language Tutorial => Passing by reference

Example

If you want the Value Types vs Reference Types in methods example to work properly, use the ref keyword in your method signature for the parameter you want to pass by reference, as well as when you call the method.

public static void Main(string[] args)
{
    ...
    DoubleNumber(ref number); // calling code
    Console.WriteLine(number); // outputs 8
    ...
}

public void DoubleNumber(ref int number)
{
    number += number;
}

Making these changes would make the number update as expected, meaning the console output for number would be 8.

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C# Language Value type vs Reference type Passing by reference

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