Browser IE download Chinese filename garbled problem __ garbled problem

When using IE to download Chinese files, there will be garbled (there is no such problem in chrome), the solution is to use UrlEncode, as follows

public static void Downloadexcel (Hssfworkbook book, String filenamepre)
        {
            var stream = new MemoryStream ();
            Book. Write (stream);
            Stream. Flush ();
            Stream. Position = 0;

            String fileName = Httputility.urlencode (string. Format ("{1}_{0:yyyy-mm-dd_hh_mm}.xls", System.DateTime.Now, Filenamepre));
            HttpResponse response = HttpContext.Current.Response;
            Response. ContentType = "application/vnd.ms-excel";
            Response. AddHeader ("Content-disposition", String. Format ("attachment;filename={0}", filename));
            Response. Clear ();
            Response. BinaryWrite (stream. GetBuffer ());
            Response. End ();
        }