gridview导出csv的问题

Question

GridView1.DataSource = myDataSet;
            GridView1.DataBind();            GridView1.AllowPaging = false;
            GridView1.AllowSorting = false;
            /////////////////////////////////////////////////////////
            Response.Clear();
            Response.Buffer = true;
            Response.ContentEncoding = Encoding.GetEncoding("gb2312");
            Response.Charset = "";
            Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(filename.Replace(" ", "") + ".csv", System.Text.Encoding.UTF8));
            Response.ContentType = "text/txt";            StringBuilder sb = new StringBuilder();            Page page = new Page();
            HtmlForm form = new HtmlForm();            GridView1.EnableViewState = false;
            // Deshabilitar la validación de eventos, sólo asp.net 2
            page.EnableEventValidation = false;
            // Realiza las inicializaciones de la instancia de la clase Page que requieran los diseñadores RAD.
            page.DesignerInitialize();            page.Controls.Add(form);
            form.Controls.Add(GridView1);            StringWriter sw = new StringWriter(sb);            try
            {
                //SaveFileDialog sfd = new SaveFileDialog();//myGridView.Columns[2].HeaderText, myGridView.Columns[3].HeaderText,//品牌,  产品名称,导出时不给外呼公司看到
                sw.WriteLine(string.Format("{0},  {1},  {2},  {3},  {4},  {5}", GridView1.Columns[0].HeaderText, "ID", GridView1.Columns[1].HeaderText, GridView1.Columns[2].HeaderText, GridView1.Columns[3].HeaderText, GridView1.Columns[4].HeaderText));                int i = 1;
                foreach (DataRow dr in myDataSet.Tables[0].Rows)
                {
                    sw.WriteLine(string.Format("{0},  {1},  {2},  {3},  {4},  {5}", i, dr["oident"].ToString(), dr["number"].ToString(), dr["t_ident"].ToString(), dr["fDate"].ToString(), dr["cName"].ToString()));
                    i++;
                }
            }
            catch (Exception ex)
            {
                ex.Message.ToString();
            }
            finally
            {
                sw.Close();
                sw.Dispose();
            }            Response.Write(sb);
            Response.End();---------用此方法csv里没有乱码，但有异常：由于代码已经过优化或者本机框架位于调用堆栈之上,无法计算表达式的值
            //System.Web.HttpContext.Current.ApplicationInstance.CompleteRequest();----------用此方法csv里有乱码，如：
" <table cellspacing=""0"" cellpadding=""1"" rules=""all"" border=""1"" id=""GridView1"" style=""border-color:#E3F0FF;border-width:1px;border-style:solid;width:738px;border-collapse:collapse;word-break:break-all;word-wrap:break-word"">"。有好的解决方法吗？

Answer 1

    Response.ContentEncoding = Encoding.GetEncoding("gb2312"); 
System.Text.Encoding.UTF8)); 
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