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Question

 Response.Clear();
            Response.ClearHeaders();
            Response.Buffer = true;
            Response.AddHeader("Content-Length", fi.Length.ToString());
            Response.ContentType = "application/application/octet-stream";
            Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fi.Name));
            Response.WriteFile(fi.FullName);
            Response.End();
            Response.Flush();
            Response.Clear();

Answer 1

+1
Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fi.Name));
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