Losing session values of an arraylist with release build?? help

[Guest]

Hi,

I have a case where an item could have n subitems, so while doing the
alterations to the subitems, I need to keep the arraylist in session.

It was working fine in the development machine, till I put the code on a
test server, where I realized that it is losing the session information
everytime I do a request!

Here are the ways I manipulate the session subitem in general:
----------------------------------------------------------------------------
Session("SIArray") = New ServicoItensCollection
.....
Dim SIArray As ServicoItensCollection= CType(Session("SIArray"),
ServicoItensCollection)
......
BindSubItemGrid(SIArray)

Session("SIArray") = SIArray