导出excel

1.导出html语句
       public void OutExcel(object sender, EventArgs e)
        {
            var tbHtml = thtml.Value;
            System.Web.HttpContext.Current.Response.Charset = "UTF-8";
            System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
            System.Web.HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode("OA.xls", System.Text.Encoding.UTF8).ToString());
            System.Web.HttpContext.Current.Response.ContentType = "application/ms-excel";
            System.IO.StringWriter tw = new System.IO.StringWriter();
            System.Web.HttpContext.Current.Response.Output.Write(tbHtml);
            System.Web.HttpContext.Current.Response.Flush();
            System.Web.HttpContext.Current.Response.End();
        }