.net ajax 1.0 aysc callback modifies form movement server.transfer used

i have web form i am attempting exercise enterprising dump down lists controlling .net ajax 1.0 extensions. i have successfully implemented indispensable bits, nonetheless have an engaging quirk.

when i name value initial dump down list, behind happens page updated correctly. unbroken value i select, i accept following error:

sys.webforms.pagerequestmanagerservererrorexception:
an opposite blunder occurred while
guess ask server.
station formula returned was: 404

reguarless control i first, initial ask works second does not. looking during iis logs, i following lines:

2008-10-17 14:52:14 w3svc1 127.0.0.1
post
/aware/xtend/mparticipant/newplannedservice.aspx
win=participant_1224255079212&title=participant
80 - 127.0.0.1 200 0 0

2008-10-17
14:52:20 w3svc1 127.0.0.1 post
/aware/mparticipant/newplannedservice.aspx
win=participant_1224255079212&title=participant
80 - 127.0.0.1 404 0 0

as post url totally changed. controlling fiddler watch request/response, i response server:

|formaction||newplannedservice.aspx|

this simply name page being executed, family route query twine secluded off.

i solve emanate adding following finish async callback method:

this.form1.action = request.url.pathandquery

but seems impossibly sore smells rather moldy cheese me. any indicate me right direction?

update: on offer review i detected newplannedservice.aspx uncanny executing page. page1.aspx executing following called server.transfer("/folder/newplannedservice.aspx"). uri browser , nonetheless tangible page executing