ASP.NET __VIEWSTATE problem

[James Clark]

I am attempting to load test a simple ASP.NET application, which GETS a 
default login page and then POSTS login information back to that page, 
but I'm getting an exception from .NET that it doesn't like the 
__VIEWSTATE (hidden variable that .NET uses to track state of form 
variables) data I'm posting. I'm pursuing a fix for this from the .NET 
side, but my guess is that a fairly simple change will get JMeter to 
handle __VIEWSTATE. Apparently, .NET does some verification that the 
page hasn't been tampered with and I'm guessing that that check is 
seeing some difference between what the initial GET request receives and 
what I'm extracting and posting back. I don't see any difference but 
it's a huge random string, so hard to tell.

I'm using JMeter 1.9.1 with JDK 1.4 on WinXP. Any insights welcome. TIA

TestPlan looks like this:

ThreadGroup (for now, 1 thread)
|--UserParameters (__CSVRead's login info)
|--HTTP Request Defaults
|--HTTP Request (GET default login aspx page)
 |--Regex Extractor (extract the VIEWSTATE value: see below for details)
|--HTTP Request (POST login info UserParameters and VIEWSTATE extracted 
info: see below for details)
|--various listeners

The regex:
reference name:     viewstate
regular expression: name="__VIEWSTATE" value="(.*)"
template:        $0$
match no:        1
default value:      ERROR
the HTTP POST request:
Name:            __VIEWSTATE   
value:            ${viewstate_g1}   
encoded?:        false  (I also try 'true' which gives a different 
exception, see below)
include equals?:    true

The server responds:

The viewstate is invalid for this page and might be corrupted.
Exception Details: System.Web.HttpException: The viewstate is invalid 
for this page and might be corrupted.
[HttpException (0x80004005): The viewstate is invalid for this page and 
might be corrupted.]
  System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +149
  System.Web.UI.Page.LoadPageViewState() +18
  System.Web.UI.Page.ProcessRequestMain() +423



If I change the POST requests encoding to 'true' I get a different 
error--I think that the viewstate is already encoded and setting this 
true scrambles it, so I just provide this to be complete.

Index was outside the bounds of the array.
[IndexOutOfRangeException: Index was outside the bounds of the array.]
  omcct.defaultForm.Button1_Click(Object sender, EventArgs e) in 
\\blah\default.aspx.vb:102
  System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108
  
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String 
eventArgument) +57
  System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler 
sourceControl, String eventArgument) +18
  System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
  System.Web.UI.Page.ProcessRequestMain() +1277

FWIW, I have followed M$' advice and tried turning off some things on 
the server side (Page directives), to no avail:
EnableViewState="false"
EnableViewStateMAC="false" 

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