Does anyone know how to fix this problem? On form submittal I'm getting the
following error in Visual Studio 2005:

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:


[No relevant source lines]


Source File: c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET
Files\safr\118004fd\203f0603\App_Web_sv3-fnpn.48.cs    Line: 0

Stack Trace:


[FormatException: Invalid character in a Base-64 string.]
   System.Convert.FromBase64String(String s) +0
   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +134

System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState) +30
   System.Web.UI.ClientScriptManager.EnsureEventValidationFieldLoaded() +212

[ViewStateException: Invalid viewstate.
    Client IP: 127.0.0.1
    Port:
    User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET
CLR 1.1.4322; .NET CLR 2.0.50727)
    ViewState:
/wEWAgKOg/LRDgKN4NHjBij4PKMgzQWEZZkIk8JSlKYY7EC/,/wEWDAKCxZ+jDQKkpuXGBwL69am5BgLh797wDAK1sI/HCgLvjO4YAo3g0eMGAsyw8osKAvWVzI0KAorJ7tsBAq7EpukBAvbp+p0Djowsg+f3etZ7ubdiJW0xlk3WE2Y=
    Referer: http://localhost:2732/SAFR/SystemForm.aspx?SystemID=7135
    Path: /SAFR/SystemForm.aspx]

[HttpException (0x80004005): The state information is invalid for this page
and might be corrupted.]
   System.Web.UI.ViewStateException.ThrowError(Exception inner, String
persistedState, String errorPageMessage, Boolean macValidationError) +171
   System.Web.UI.ViewStateException.ThrowViewStateError(Exception inner,
String persistedState) +37
   System.Web.UI.ClientScriptManager.EnsureEventValidationFieldLoaded() +249
   System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String
argument) +202
   System.Web.UI.Control.ValidateEvent(String uniqueID, String
eventArgument) +83
   System.Web.UI.Control.ValidateEvent(String uniqueID) +35
   System.Web.UI.HtmlControls.HtmlInputText.LoadPostData(String postDataKey,
NameValueCollection postCollection) +101

System.Web.UI.HtmlControls.HtmlInputText.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +36
   System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean
fBeforeLoad) +478
   System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5915
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint,
Boolean includeStagesAfterAsyncPoint) +188
   System.Web.UI.Page.ProcessRequest() +112
   System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +37
   System.Web.UI.Page.ProcessRequest(HttpContext context) +135
   ASP.systemform_aspx.ProcessRequest(HttpContext context) in
c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET
Files\safr\118004fd\203f0603\App_Web_sv3-fnpn.48.cs:0

System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +401
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously) +117



--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET
Version:2.0.50727.42

Hi Bill,

Welcome to ASPNET newsgroup.
From your description, after upgrated to asp.net 2.0, one of your asp.net
page will always throw some validation exception when running, yes?

Does the exception always occur only when you postback the page? Also, from
the page's aspx and codebehind, can you find any particular changes in it?
Based on my experience, since ASP.NET 2.0 use  "EnableEventValidation" by
default, so if you page programmatically output some clientside script for
post back or write out some html form elememt, there'll raise such
validation exception when post back....   You can try turn off the
"EnableEventvalidation" in @Page directive to see whether it helps...

@ Page  
http://msdn2.microsoft.com/en-us/library/ydy4x04a.aspx

If there're anything else you found, please feel free to post here also.

Regards,

Steven Cheng
Microsoft Online Support

Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)


--------------------
Show quoteHide quotemicrosoft.public.dotnet.framework.aspnet:368852
Show quoteHide quoteSystem.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize
(String serializedState) +30
/wEWAgKOg/LRDgKN4NHjBij4PKMgzQWEZZkIk8JSlKYY7EC/,/wEWDAKCxZ+jDQKkpuXGBwL69am
5BgLh797wDAK1sI/HCgLvjO4YAo3g0eMGAsyw8osKAvWVzI0KAorJ7tsBAq7EpukBAvbp+p0Djow
sg+f3etZ7ubdiJW0xlk3WE2Y=
Show quoteHide quoteSystem.Web.UI.HtmlControls.HtmlInputText.System.Web.UI.IPostBackDataHandler.
LoadPostData(String postDataKey, NameValueCollection postCollection) +36
Show quoteHide quoteSystem.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionSte
p.Execute() +401
Show quoteHide quote

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