前端程式碼：

<a id="upload" href="@Url.Content("~/goods/DownLoadGoodsVideo?n_name={檔案舊名稱}&o_name={檔案新名稱}”)" target="_blank">【點選下載】</a>

後端程式碼：

 [HttpGet]
        public void DownLoadGoodsVideo(string n_name,string o_name)
        {
            if (!string.IsNullOrEmpty(n_name))
            {
                HttpResponse response = System.Web.HttpContext.Current.Response;
                string path = System.Web.HttpContext.Current.Server.MapPath(@"~\\UploadFile\\" + n_name);
                FileInfo fi = new FileInfo(path);
                if (fi.Exists)
                {
                    response.Clear();
                    response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpContext.Current.Server.UrlEncode(o_name));
                    response.AddHeader("Content-Length", fi.Length.ToString());
                    response.ContentType = "application/octet-stream";
                    response.Filter.Close();
                    response.WriteFile(fi.FullName);
                    response.End();
                }
                else
                {
                    response.Status = "404 File Not Found";
                    response.StatusCode = 404;
                    response.StatusDescription = "File Not Found";
                    response.Write("File Not Found");
                    response.End();
                }
            }
        }