Question

I have make a messaging system in which user can send messages to each other, they can also send files as attachement in message(its like simple email system).
I am facing an issue in firefox, if file name contains space(eg 602_Sign File for ticket.doc)
in firefox it’ll save with 602_Sign.doc however it should display complete name,issue is working fine on IE and chrome,below is my code for downloading file

public ActionResult Download(string attFileName)
        {
            string FileName = Path.Combine(Server.MapPath("~/MessageAttachmentFiles"), attFileName);
            System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
            response.ClearContent();
            response.Clear();
            Response.AddHeader("Content-Disposition", string.Format("attachment; filename = {0}", System.IO.Path.GetFileName(FileName)));
            response.TransmitFile(FileName);
            response.Flush();
            response.End();
            return null;

        }

Answer 1

The below should work

response.AddHeader("Content-Disposition", 
                    string.Format("attachment; filename = \"{0}\"",
                    System.IO.Path.GetFileName(FileName)));

More details on why http://kb.mozillazine.org/Filenames_with_spaces_are_truncated_upon_download