invalid viewstate error - OnPreRender
- by dan
I'm getting 100+ errors per day on my website with System.Web.HttpException: Invalid viewstate.
The website is asp.net 3.5 running on iis6 , not running in a web-garden/web-farm , single server.
Here are a few sample errors.
Machine: ML Framework Version: 2.0.50727.3603 Assembly Version: 6.5.3664.33889
Source: http://www.domain.com/WebResource.axd?d=z5VmXXoSLLpQHoPictureAlert
Exception: System.Web.HttpException: Invalid viewstate. at System.Web.UI.Page.DecryptStringWithIV(String s, IVType ivType) at System.Web.Handlers.AssemblyResourceLoader.System.Web.IHttpHandler.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Machine: MLFramework Version: 2.0.50727.3603 Assembly Version: 6.5.3664.33889
Source: http://www.mydomain.com/ScriptResource.axd?d=SE0Ej7OlEAx91j2Cjv_6KkRPplqT-5wB4M7CZPdGdGn3LahLwqlRPApUcdxBsbFXYHZ91Q76FHAHWgHs8SmOC4zemr7
siym0QY0rF3XtJTu%3C/a%3E%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%3Ca%20id=
Exception: System.Web.HttpException: Invalid viewstate. at System.Web.UI.Page.DecryptStringWithIV(String s, IVType ivType) at
System.Web.UI.Page.DecryptString(String s) at System.Web.Handlers.ScriptResourceHandler.DecryptParameter(NameValueCollection queryString) at
System.Web.Handlers.ScriptResourceHandler.ProcessRequestInternal(HttpResponse response, NameValueCollection queryString,
VirtualFileReader fileReader) at System.Web.Handlers.ScriptResourceHandler.ProcessRequest(HttpContext context) at
System.Web.Handlers.ScriptResourceHandler.System.Web.IHttpHandler.ProcessRequest(HttpContext context) at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
i already tried wraping all inline javascript with //<![CDATA[ //]]>
i already set enableViewStateMac to false.
From looking at all the errors guessing out of the "d" paramter it seems to focus on a single usercontrol on my website.
in this control i change the visiblity of div's + text in the usercontrol OnPreRender function.
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
PreparePage();
}
Can the errors be related to the usercontrol behavioral?
thanks!
