What will be the output of the following C# code?

class box
{
    public int volume;
    int width;
    int height;
    int length;
    public box ( int w, int h, int l)
    {
        width = w;
        height = h;
        length = l;
    }
   public ~box()
   {
       volume = width * length * height;

   }

}    
class Program
{
    static void Main(string[] args)
    {
       box b = new box(4, 5, 9);
       Console.WriteLine(b.volume);
       Console.ReadLine();
   }
 
}