// Example application for code from
// https://jonskeet.uk/csharp/parameters.html
// 
// To compile the code, run (from a command prompt
// with the appropriate environment variables set):
// csc Example6.cs
// 
// To run the code after compilation, just run Example6.exe

using System;
using System.Text;

public class Example6
{
    // Note that Foo is declared static here just
    // to make the sample app simple, so we don't
    // need to instantiate the example class. This
    // has no bearing on the parameter passing
    // discussed
    static void Foo (ref StringBuilder x)
    {
        x = null;
    }

    public static void Main (string[] args)
    {
        StringBuilder y = new StringBuilder();
        y.Append ("hello");
        Foo (ref y);
        Console.WriteLine (y==null);
    }
}