System.Web.HttpException: Invalid viewstate

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Hi All,
Can you please tell me the Solution for this 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)

Posted 24-Jun-11 2:05am

Ganesh Dutt Pandey

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Pete O'Hanlon · Answer 1 · 2011-06-24T02:25:00

Without seeing what the rest of your code does, no. However, common causes of invalid viewstate include custom controls manually adding to viewstate in an inconsistent manner (normally this is visible if AJAX code is present, but incorrectly implemented for rendering updates to the page), and viewstate being validated against a web farm where the web farm isn't set up properly, so the machine key is different on each server - causing problems because the machine key is used in the validation of the viewstate.