Hi,

I have a simple hidden field in my application:

<ext:Hidden ID="someID" runat="server">
</ext:Hidden>
It is located on a control that is not initially visible. I receive the following exception during the page initial load:

General Error: 0 : Timestamp: 2008-12-10 14:49:35
Message: 
Category: General
Priority: 1
EventId: 0
Severity: Error
Title:
Machine: MASTER
App Domain: 77da83f8-3-128733940574779759
ProcessId: 13200
Process Name: C:\Program Files (x86)\Common Files\Microsoft Shared\DevServer\9.0\WebDev.WebServer.EXE
Thread Name: 
Win32 ThreadId:21152
Extended Properties: Exception - System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Coolite.Ext.Web.Hidden.set_Value(Object value)
   at Coolite.Ext.Web.Hidden.LoadPostData(String postDataKey, NameValueCollection postCollection)
   at Coolite.Ext.Web.Field.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection)
   at System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   --- End of inner exception stack trace ---
   at System.Web.UI.Page.HandleError(Exception e)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at ASP.default_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\idfmc\fff803cd\97ac1b45\App_Web_xiki32au.0.cs:line 0
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously)
AuthenticationType - Forms
IdentityName - admin
IsAuthenticated - True
The exception is thrown only when StateProvider="PostBack". It is not thrown when StateProvider="None". (StateProvider="Cookie" is not working for some reason with AjaxEvents for us, but it's another story).

Is there a way to get rid of that exception?

Regards,
Tadeusz