private void DownLoad(string fileName, string path)

        {

            FileInfo fi = new FileInfo(path);

            if (fi.Exists)

            {

                Response.Clear();

                Response.ClearContent();

                Response.ClearHeaders();

                Response.Buffer = true;

                Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);

                Response.AddHeader("Content-Length", fi.Length.ToString());

                Response.AddHeader("Content-Transfer-Encoding", "binary");

                Response.ContentType = "application/octet-stream";

                Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");

                Response.WriteFile(path);

                Response.Flush();

                Response.End();

            }

        }

        private void DownLoad2(string fileName, string path)

        {

            FileInfo fi = new FileInfo(path);

            if (fi.Exists)

            {

                Response.Clear();

                Response.Buffer = true;

                Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);

                Response.ContentType = "application/unknow";

                Response.TransmitFile(path);

                Response.End();

            }

        }