Asp.net文件下载

string path = @"F:\me\Smile\1\Web\image\1.jpg";
            string name = "1.jpg";
            FileInfo Downloadfile = new FileInfo(path);
            Response.Clear();
            Response.ClearHeaders();
            Response.Buffer = false;
            Response.ContentType = "application/octet-strearm";
            Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(name, System.Text.Encoding.UTF8));
            Response.AppendHeader("Content-Length", Downloadfile.Length.ToString());
            Response.WriteFile(Downloadfile.FullName);
            Response.Flush();
            Response.End();