protected void btn_submit_Click(object sender, EventArgs e)
    {
        string profile_photo_url = "";
        int    reg_id            = Convert.ToInt32(Session["reg_id"].ToString());
        string currentDateTime   = string.Format("{0:mmddyyhhmmss}", DateTime.UtcNow);

        if (fu_profile_photo.HasFile)
        {
            profile_photo_url = "~/Lib/images/" + reg_id + "_" + currentDateTime + ".jpg";
            fu_profile_photo.SaveAs(Server.MapPath(profile_photo_url));
        }
        int i = bl.insert_candidate(reg_id, txt_unions.Text, Convert.ToInt32(drp_post.SelectedValue), Convert.ToInt32(txt_percentage.Text), profile_photo_url);

        if (i > 0)
        {
            lbl_request.Visible = true;
        }
        // int cnd_id = bl.get_cnd_id(reg_id);
        // Session["cnd_id"] = cnd_id;

        // Response.Redirect("stu_cnd_view.aspx");
    }