BUG: Asp.Net2 EventValidation + DataGrid + PushButton Error .

[DotQuery]

Hello ASP.NET team :

I have a user control that be added into page at runtime , in a postback
event handler .

I save the information to view state , and load the user control again in
CreateChildControls again .

There's a datagrid in the user control .
The datagrid bind the data when the user control be loaded at the first
time.

When I use 'LinkButton' for the delete button , it work well .

When I change to 'PushButton' , an error be thrown .

I think my program have no problem . Please check why 'PushButton' has such
exception ?

----------------------------------------------------------------------------
System.Web.HttpUnhandledException: Exception of type
'System.Web.HttpUnhandledException' was thrown. --->
System.ArgumentException: Invalid postback or callback argument. Event
validation is enabled using in configuration or in a page. For security
purposes, this feature verifies that arguments to postback or callback
events originate from the server control that originally rendered them. If
the data is valid and expected, use the
ClientScriptManager.RegisterForEventValidation method in order to register
the postback or callback data for validation.
at System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String
argument)
at System.Web.UI.Control.ValidateEvent(String uniqueID, String
eventArgument)
at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
at
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler
sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
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.page_aspx.ProcessRequest(HttpContext context) in
c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET
Files\website\99b74d5c\80b811c2\App_Web_2xqcsb4i.2.cs:line 0
at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously)