ขอตัวอย่าง code เปิดไฟล์ excel ที่อยู่บน server หน่อยค่ะ

<asp:LinkButton ID="btDownload" runat="server" Text="Download" OnClick="btDownload_Click" />

protected void lnkDownload_Click(object sender, EventArgs e) {
         string fileName = "NCSR_PEM.xls";
         string filePath = Server.MapPath("~\\ncsr\\" + fileName);
         string attachment = "attachment; filename=" + fileName;

         Response.ClearContent();
         Response.AddHeader("content-disposition", attachment);
         Response.ContentType = "application/ms-excel";
         Response.TransmitFile(filePath);
         Response.End();
}