Dynamic Message idea

        [TestMethod]
        public void should_set_parameter()
        {
            var message = new Message() as dynamic;

            message.Foo = "foo";

            var foo = message.Foo as string;
            foo.ShouldBe("foo");
        }

        [TestMethod]
        public void should_contain_parameter()
        {
            var message = new Message() as dynamic;

            message.Foo = "foo";

            bool contains = false;
            if (message.ContainsFoo)
            {
                contains = true;
            }
            contains.ShouldBeTrue();
        }

        [TestMethod]
        public void should_does_not_contain_parameter()
        {
            var message = new Message() as dynamic;

            message.Foo = "foo";

            bool doesNotContain = false;
            if (message.DoesNotContainFoo)
            {
                doesNotContain = true;
            }
            doesNotContain.ShouldBeTrue();
        }