How to download list item attachment from display.aspx

Question

Im uploading documents
to list item in list by
using file upload control. Now I should download that file. I can able to insert documents into list item in attachment column which is predefined but am how can I download the attachments by clicking on the link in display.aspx.
I have written this for uploadFile controller.
SPSite site = SPContext.Current.Site;
SPWeb web = site.OpenWeb();
SPList list = web.Lists["list2"];
//SPListItem itemId = list.GetItemById(5);
int itemId=3;
SPListItem newItem = list.GetItemById(itemId);
byte[] contents = null;
if (FileUpload1.PostedFile != null && FileUpload1.HasFile)
using (Stream fileStream = FileUpload1.PostedFile.InputStream)
contents = new byte[fileStream.Length];
fileStream.Read(contents, 0, (int)fileStream.Length);
fileStream.Close();
SPAttachmentCollection attachments = newItem.Attachments;
string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
attachments.Add(fileName, contents);
newItem["CLMSAttachments"] = fileName;
newItem.Update();
Thanks in advance.

Answer 1

Hi ,
It is your browser that decides to download/open the file.
If you have compatible client software for the file (word for docx) your computer will by default automatically try to open it.
But we can force the download. You have to develop a handler/aspx page that will just handle the file download and you have to override the http header "content-disposition" to "attachment;filename=yourfilename"
Here a sample :
var fileName = "myfile.sql";
var r = context.Response;
r.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
r.ContentType = "text/plain";
r.WriteFile(context.Server.MapPath(fileName));
Hope that will help you
Moudhafer