public class Toilet : IDisposable
{
    object mutex = new object();
    byte[] waste = new byte[10000000];

    ~Toilet()
    {
        Dispose();
    }

    public void Dispose()
    {
        lock(mutex){
            Console.WriteLine("Flushing");
            waste = null;
            GC.SuppressFinalize(this);
        }
    }
}