public ActionResult Download(int ID)
        {
            TAI_LIEU doc = db.TAI_LIEU.SingleOrDefault(x => x.IDTaiLieu == ID);

            Response.Clear();
            Response.ContentType = "application/octect-stream";
            Response.AppendHeader("content-disposition", "filename=" + doc.FilePath);
            Response.TransmitFile(Server.MapPath("~/Content/Document/") + doc.FilePath);
            Response.End();
            return(RedirectToAction("Index"));
        }
 public ActionResult ThemTaiLieu(TAI_LIEU model)
 {
     if (ModelState.IsValid)
     {
         var file = Request.Files["FilePath"];
         if (file != null && file.ContentLength > 0)
         {
             string path = Server.MapPath("../../../Content/Document/" + file.FileName);
             file.SaveAs(path);
         }
         db.TAI_LIEU.Add(model);
         db.SaveChanges();
         return(RedirectToAction("Index"));
     }
     return(View());
 }