How to compress folder in zip file and download?

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ASP.NET

Hi all,

Hope doing well,

i am having one subfolder in folder in the server which i am trying to compress and download.

here is my code:

string subfol = Session["inbpostedfol"].ToString();
           string fullpath = Server.MapPath("~/InboxFiles/" + subfol);
           FileInfo flie = new FileInfo(fullpath);
           Response.Clear();
           Response.ContentType = "application/zip";
           Response.AddHeader("content-disposition", "attachment; filename=" + subfol + ".zip");
           using (ZipFile zipfile = new ZipFile())
           {
               zipfile.AddSelectedFiles("*.*", subfol, fullpath);
               zipfile.Save(Response.OutputStream);
           }

but not getting the file in compressed folder.

thanks