GridView（DataSet）匯出資料到Excel檔案代碼C#

public override void VerifyRenderingInServerForm(Control control)
    {
        //base.VerifyRenderingInServerForm(control);
    }

private void Export(GridView gvUser, string Style, string FileType, string FileName)
    {
        Response.ClearContent();
        Response.Charset = "GB2312";
        Response.ContentEncoding = System.Text.Encoding.UTF8;
        Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8).ToString());
        Response.ContentType = FileType;
        //page.Response.ContentType = "application/ms-excel";
        Page.EnableViewState = false;
        StringWriter sw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(sw);
        //turn off paging
        gvUser.AllowPaging = false;
        BindGrid(gvUser);

        gvUser.RenderControl(hw);
        Response.Write(Style);
        Response.Write(sw.ToString());
        //page.Response.Flush();
        Response.End();

        //turn the paging on again
        gvUser.AllowPaging = true;
        BindGrid(gvUser);
    }
    private void BindGrid(GridView gvUser)
    {
        DataSet ds = new DataSet();
        ds = Session["myDataSet"] as DataSet;
        gvUser.DataSource = ds;
        gvUser.DataBind();
    }

protected void gvMessageByGroup_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        e.Row.Attributes.Add("onmouseover", "currentcolor = this.style.backgroundColor;this.style.backgroundColor = '#cee5f8'");
        e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor =currentcolor;");
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Cells[3].Attributes["class"] = "text";
        }
    }

protected void lbtnExportToExcel_Click(object sender, EventArgs e)
    {
        string strStyle = @"<style> .text { mso-number-format:/@; }</style>";
        Export(gvMessageByGroup, strStyle, "application/ms-excel", "myExcel.xls");
    }