RegisterForEventValidation can only be called during Render()

To know about creating a Grid view with Paging and Exporting the view to Word and Excel documents read this article.
The following is the screen shot which you get due to this error:


This error occurs whenever we are trying to render control to response. To fix this problem I have added EnableEventValidation="false" to @Page directive of aspx page.
This will look like as follows:
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" EnableEventValidation="false" %>
This code will fix this issue.

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