GridView导出Excel

当用GridView导出Execl的时候，会发生只能在执行 Render() 的过程中调用 RegisterForEventValidation的错误提示。
有两种方法可以解决以上问题：
1.修改web.config(不推荐)<pages enableEventValidation ="false" ></pages>
2.直接在导出Execl的页面修改
<%@ Page Language="C#" EnableEventValidation = "false" AutoEventWireup="true" CodeFile="ExportGridView.aspx.cs" Inherits="ExportGridView" %>

<%@ Page Language="C#" EnableEventValidation = "false" AutoEventWireup="true" CodeFile="ExportGridView.aspx.cs" Inherits="ExportGridView" %>

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;

namespace NetSamples.aspnet
{
    public partial class ExportGridView : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindData();
            }
        }

        protected void ButtonExcel_Click(object sender, EventArgs e)
        {
            Response.Clear();
            Response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
            Response.Charset = "";

            // If you want the option to open the Excel file without saving than
            // comment out the line below
            // Response.Cache.SetCacheability(HttpCacheability.NoCache);

            Response.ContentType = "application/vnd.xls";
            System.IO.StringWriter stringWrite = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);

            // turn off paging 
            GridView1.AllowPaging = false;
            BindData();
            GridView1.RenderControl(htmlWrite);
            Response.Write(stringWrite.ToString());
            Response.End();

            // turn the paging on again 
            GridView1.AllowPaging = true;
            BindData();

        }

        public override void VerifyRenderingInServerForm(Control control)
        {
            //base.VerifyRenderingInServerForm(control)
            // Confirms that an HtmlForm control is rendered for;
        }

        private void BindData()
        {
            string connString = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;
            string sql = "select * from products";
            SqlConnection conn = new SqlConnection(connString);
            SqlCommand cm = new SqlCommand(sql, conn);
            conn.Open();
            SqlDataAdapter ad = new SqlDataAdapter();
            ad.SelectCommand = cm;
            DataTable tb = new DataTable();
            ad.Fill(tb);
            conn.Close();
            this.GridView1.DataSource = tb;
            this.GridView1.DataBind();
        }

        protected void GridView1_PageIndexChanging(object sender,GridViewPageEventArgs e)
        {
            GridView1.PageIndex = e.NewPageIndex;
            BindData(); 
        }
    }
}