asp.net mvc 2 - Multiple serializations on state server corrupt property value -

i have abnormal serialization/de-serialization behavior in asp.net mvc application.

setup , architecture follows:

.net 3.5, mvc 2, unity 2.0 dependency injection, iis 7. state stored in aspnet state process. application apart models, views , controllers contains number of application specific services , model mappers (for interfacing existing code). 2 of services have per session based lifetime, implemented custom persessionlifetimemanager (as unity not have 1 out of box). lifetime manager uses httpcontext.current.session store objects. there fair bit of dependencies between controllers, mappers, services , between services well.

problem:

one of session lifetime services contains private boolean field changes value under internal logic conditions, value changes outside of code. after investigation found problem relates object being serialized/de-serialized twice every time , values of field different during serializations.

investigation done far:

i have break points/logging on object constructor , wrapped field property , put breakpoint/logging on setter. object constructed once , there no calls change property value except should called. have made object implement iserializable , put logging of system.threading.thread.currentthread.managedthreadid , object hash (constructed fields of object). can see if value of property/field changes object gets serialized twice once new value , after original value. next time object used de-serializes in lifo order, original (unchanged) value object pulled out first , changed one. tried log full stack trace these serialization calls, seem .net internal calls.

questions:

why there multiple serializations different values? how avoid this?

current work around:

i used session instead of private field/property , works fine, use of session on heavily loaded websites not best thing , hoping other solution.

thank you.

are sure value becoming corrupted or loosing value due session being purged. have other values in session disappear @ same time? bit confused "state stored in aspnet state process. " statement. session management set inproc or using stateserver? if inproc, experience loss of session values (especially in shared hosting environments), , should switch asp state server service or mssql state server solution.