I am in the process of upgrading an employee portal that was built several years ago to the latest version of DNN and importing it into VS2008. Right now I have opened the files in the VS2008 with the old version of DNN. The website loads but if at anytime I click a button that posts a form I get an error saying:

The state information is invalid for this page and might be corrupted.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: The state information is invalid for this page and might be corrupted.

Source Error:

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

  <%@ Page Language="C#" Debug="true" %>

or:

2) Add the following section to the configuration file of your application:

<configuration>
   <system.web>
       <compilation debug="true"/>
   </system.web>
</configuration>

Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.

It says I need to add lines of code that allow debugging, and after my best attempts to do so, I still get the error. Has anyone encountered this error before? Do I need to upgrade the DNN version first before moving on? Any ideas are appreciated.

Thanks