In C#4.0, we have dynamic type, but how to invoke static method of dynamic type object?

Below code will generate exception at run time.

class Foo
{
    public static int Sum(int x, int y)
    {
        return x + y;
    }
}

class Program
{

    static void Main(string[] args)
    {
        dynamic d = new Foo();
        Console.WriteLine(d.Sum(1, 3));

    }
}

IMHO, dynamic is invented to bridge C# and other programming language. There is some other language (e.g. Java) allows to invoke static method through object instead of type.

BTW, The introduction of C#4.0 is not so impressive compared to C#3.0.