ASP.NET的GridView在UpdatePanel裡匯出Excel的語句

在ASP.NET中應用微軟AJAX技術，把GridView在UpdatePanel裡匯出Excel時會出現的錯誤。
就是在ASP.NET2.0架構中當用GridView匯出Execl的時候，會發生只能在執行 Render() 的過程中調用 RegisterForEventValidation的錯誤提示。 

方法一：（好像還是不行）
在ajax裡面Response.Write會有衝突，你得為UpdatePanel添加 <triggers> 屬性，把ControlID指嚮導出按扭的ID
<asp:Button ID="Button3" runat="server" Text="匯出Excel" OnClick="Button3_Click" />
    </ContentTemplate>
    <Triggers>
        <asp:PostBackTrigger ControlID="Button3"></asp:PostBackTrigger>
    </Triggers>

CS:
protected void Button3_Click(object sender, EventArgs e)
    {
        Export("application/ms-excel", "產品資訊表.xls");
    }
    private void Export(string FileType, string FileName)
    {
        GridView1.EnableViewState = false;
        Response.Charset = "GB2312";
        Response.ContentEncoding = System.Text.Encoding.UTF7;
        Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
        Response.ContentType = FileType;
        this.EnableViewState = false;
        StringWriter tw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(tw);
        GridView1.RenderControl(hw);
        Response.Write(tw.ToString());
        Response.End();
    }
方法二：（可以）
            Response.Clear();
            Response.Buffer = true;
            Response.Charset = "GB2312";
            Response.AppendHeader("Content-Disposition", "attachment;filename=FileName.xls");
            // 如果設定為 GetEncoding("GB2312");匯出的檔案將會出現亂碼！！！
            Response.ContentEncoding = System.Text.Encoding.UTF7;
            Response.ContentType = "application/ms-excel";//設定輸出檔案類型為excel檔案。
            System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
            this.GridView1.RenderControl(oHtmlTextWriter);
            Response.Output.Write(oStringWriter.ToString());
            Response.Flush();
            Response.End();
        }

    }
//必須重載此函數
    public override void VerifyRenderingInServerForm(Control control)
    { }

方法四：（可能出現亂碼）
public void CreateExcel(DataSet ds, string typeid, string FileName)
    {
        HttpResponse resp;
        resp = Page.Response;
        resp.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
        resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
        string colHeaders = "", ls_item = "";
        int i = 0;

        //
        DataTable dt = ds.Tables[0];
        DataRow[] myRow = dt.Select("");
        // typeid=="1"為EXCEL文檔；typeid=="2"XML文檔
        if (typeid == "1")
        {
            //
            for (i = 0; i < dt.Columns.Count; i++)
            {
                if (i == dt.Columns.Count - 1)
                {
                    colHeaders += dt.Columns[i].Caption.ToString() + "\n";
                }
                else
                {
                    colHeaders += dt.Columns[i].Caption.ToString() + "\t";
                }
            }
            //
            resp.Write(colHeaders);
            //
            foreach (DataRow row in myRow)
            {
                //
                for (i = 0; i < dt.Columns.Count; i++)
                {
                    if (i == dt.Columns.Count - 1)
                    {
                        ls_item += row[i].ToString() + "\n";
                    }
                    else
                    {
                        ls_item += row[i].ToString() + "\t";
                    }
                }
                //
                resp.Write(ls_item);
                ls_item = "";
            }
        }
        else
        {
            if (typeid == "2")
            {
                //從DataSet中直接匯出XML資料並且寫到HTTP輸出資料流中
                resp.Write(ds.GetXml());
            }
        }
        //寫緩衝區中的資料到HTTP標頭檔中
        resp.End();
    }
調用CreateExcel(ds, "1", "filename.xls");
還有三種方法可以解決以上問題： 
1.修改web.config(不推薦)<pages enableEventValidation ="false" ></pages> 
2.直接在匯出Execl的頁面修改
<%@ Page Language="C#" EnableEventValidation = "false" AutoEventWireup="true" CodeFile="ExportGridView.aspx.cs" Inherits="ExportGridView" %>
3用ScriptManager.RegisterClientScriptBlock()等方法