Excel导出 乱码解决问题

//导出方法 标题乱码 
context.Response.ClearContent();
                context.Response.AddHeader("content-disposition", "attachment; filename=" + HttpUtility.UrlEncode("XXXX" + DateTime.Now.ToString("hhMMss"), System.Text.Encoding.UTF8) + ".xls");
                context.Response.ContentType = "application/excel";
                context.Response.Write(GetGridTableHtml2(context)); 
                context.Response.End();

　　

//内容乱码

 sb.Append("<meta http-equiv=\"content-type\" content=\"application/ms-excel; charset=UTF-8\"/>");