When you send the array via GET or POST, it gets sent as a
comma separated string, so the website must rebuild the array from
that. There should be something like String.explode in VB, that
splits a string at a given seperator and returns an array, this
would do it.
But this toString() serialization is bad if the data contains
commas as well, and also when the array contains complex data, like
objects or nested arrays. In this case, you need some custom
serialization of the array data on the Flash side and
deserialization on the asp side. The Array.join() method can make
that quite easy if the array data isn't too complex.