My below codes work well on localhost but takes unusual time! and on remote server it gives error failure mail sending!.

I feel that while the steps are OK but it needs re-organizing. Looks like it gets timed out on remote server.

Could someone explain me the exact reasons and help me get this resolved.

My codes are as under:

    protected void PlaceMO_Click(object sender, EventArgs e)
    {
        try
        {
            using (StringWriter sw = new StringWriter())
            {
                using (HtmlTextWriter hw = new HtmlTextWriter(sw))
                {
                    GridView1.RenderControl(hw);
                    StringReader sr = new StringReader(sw.ToString());
                    MailAddress addressTo = new MailAddress(LblMailRS.Text);
                    MailAddress addressFrom = new MailAddress("mail@abc.online");
                    MailMessage mm = new MailMessage(addressFrom, addressTo);
                    mm.Subject = "New Order Alert! / Order No: " + ONum.Text;
                    mm.Body = "<b>" + "Room No: " + "</b>" + LblRNUser.Text + "<br />" + "<br />"
                        + sw.ToString() + "<br />"
                        + "<b>" + NetPayable.Text + "</b>" + "<br />"
                        + "<b>" + "Comments: " + "</b>" + LblComments.Text; 
                    mm.IsBodyHtml = true;
                    SmtpClient smtp = new SmtpClient();
                    smtp.Host = "abc.online";
                    smtp.EnableSsl = false;
                    System.Net.NetworkCredential NetworkCred = new System.Net.NetworkCredential();
                    NetworkCred.UserName = "mail@abc.online";
                    NetworkCred.Password = "passcode1";
                    smtp.UseDefaultCredentials = true;
                    smtp.Credentials = NetworkCred;
                    smtp.Port = 25;
                    smtp.Send(mm);
                }
            }
            DateTime UtcTi = DateTime.UtcNow;
            TimeZoneInfo tzi = TimeZoneInfo.FindSystemTimeZoneById("India Standard Time");
            DateTime LocalTi = TimeZoneInfo.ConvertTimeFromUtc(UtcTi, tzi);
            string strtme = LocalTi.ToString();
            using (SqlConnection con2 = new SqlConnection(ConfigurationManager.ConnectionStrings["CS"].ConnectionString))
            {
                con2.Open();
                SqlCommand comd2 = new SqlCommand("Update Orders Set Date = '" + strtme + "', OrderStatus = 'Ordered' Where OrderNo = '" + ONum.Text + "'", con2);
                comd2.ExecuteNonQuery();
                con2.Close();
            }
            Tick.Visible = true;
            PicPnl.Visible = false;
            PicPnl2.Visible = true;
            Order.Text = "Order No: " + Session["OrderNo"].ToString();
            Order.ForeColor = System.Drawing.Color.Green;
            PlaceMO.Visible = false;
            ViewMO.Visible = false;
            P2.Visible = true;
            GridView1.Visible = false;
        }
        catch (Exception ex)
        {
            Order.Text = ex.Message;
            Order.ForeColor = System.Drawing.Color.Red;
        }
    }