RegisterForEventValidation can only be called during Render();

Many time we are getting this error while transferring data from gridview to excel,

A error message "RegisterForEventValidation can only be called during Render();"

We can solve this error to add  EnableEventValidation="false" in source code

Example:-

<%@ Page Title="" Language="C#" MasterPageFile="~/admin/adminindex.master" AutoEventWireup="true"

    CodeFile="Contact.aspx.cs" Inherits="admin_Contact" EnableEventValidation="false" %>

And we need to add in code behind

public override void VerifyRenderingInServerForm(Control control)

    {

        /* Verifies that the control is rendered */

    }

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