how announce lambda eventuality handlers vb.net?

i trust following vb.net formula homogeneous move c# code; however vb.net exam fails - eventuality doing lambda never called.

what going on?

vb.net chronicle - fails:

<testfixture()> _
public category testclass
    <test()> _
    open servant eventtest()
        low eventclass new eventclass
        low eventraised boolean = false
        addhandler eventclass.anevent, function() (eventraised = true)
        eventclass.raiseit()
        assert.istrue(eventraised)
    finish servant    
end class

public category eventclass
    open eventuality anevent()
    open servant raiseit()
        raiseevent anevent()
    finish sub
end class

c# chronicle - passes:

[testfixture]
    open category testclass
    {
        [test]
        open vacant eventtest()
        {
            var eventclass = new eventclass();
            var eventraised = false;
            eventclass.anevent += () => { eventraised = true; }; 
            eventclass.raiseit();
            assert.istrue(eventraised);
        }
    }

    open category eventclass
    {
        open nominee vacant eventhandler();
        open eventuality eventhandler anevent;
        open vacant raiseit()
        {
            anevent();
        }
    }