Send email automatically using asp.net C# web without run the website

Mentioned code is working fine .Email is sending after running the website and run the page but i want without running the  website or page ,mail should sent .Please help in automation .

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Net;
using System.Net.Mail;
using System.Text;
using System.Data;
using System.Collections.ObjectModel;
using System.Data.SqlClient;
using System.ComponentModel; 
using System.Threading;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls.WebParts;

public partial class email : System.Web.UI.Page
{
    DBConn db1 = new DBConn();
    SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionStr"].ToString());
   
    
    protected void Page_Load(object sender, EventArgs e)
    {
        SendEmailTOAllUser();
    }
    
    protected void SendEmailTOAllUser()
    {        
        Collection EmailAddresses = new Collection();
      
        
        SqlCommand cmd = new SqlCommand("select P.ContractNo, P.SPOC,P.SPOCEmail, I.ProjectID as 'ProjectName',day(I.InvoiceDtTo) as Datedueday,month(I.InvoiceDtTo) as monthdue,year(I.InvoiceDtTo) as yeardue,I.InvoiceDtFrom 'Invoicefromdate',I.InvoiceDtTo 'InvoiceEnddate' from tbl_PaymentTracker P inner join tbl_InvoiceTrackerAuto I on P.ProjectName = I.ProjectID  order by projectid, SPOC", con);
        SqlDataAdapter adp = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        adp.Fill(ds);
       
        for (int i = 1; i<=ds.Tables[0].Rows.Count; i++)
        {       
            if (ds.Tables[0].Rows.Count > 0)
             {
                lblOwnername.Text = ds.Tables[0].Rows[0]["SPOC"].ToString();
                lblcontractno.Text = ds.Tables[0].Rows[0]["ContractNo"].ToString();
                lblprojectname.Text = ds.Tables[0].Rows[0]["ProjectName"].ToString();              
                lblfromdate.Text = ds.Tables[0].Rows[0]["Invoicefromdate"].ToString();
                lbltodate.Text = ds.Tables[0].Rows[0]["InvoiceEnddate"].ToString();
                lbldatedueday.Text= ds.Tables[0].Rows[0]["Datedueday"].ToString();
                lbldateduemonth.Text = ds.Tables[0].Rows[0]["monthdue"].ToString();
                lbldatedueyear.Text = ds.Tables[0].Rows[0]["yeardue"].ToString();
                lbltodayday.Text =Convert.ToString(DateTime.Today.Day);
                lbltodaymonth.Text = Convert.ToString(DateTime.Today.Month);
                lbltodayyear.Text = Convert.ToString(DateTime.Today.Year);

                if ((Convert.ToInt16(lbldatedueday.Text) - Convert.ToInt16(lbltodayday.Text)) <= 7)
                {
                    if(DateTime.Today <= Convert.ToDateTime(lbltodate.Text))
                    {
                        string txtMessageBody = "Hi '" + lblOwnername.Text + "' ,
Your invoice '" + lblprojectname.Text + "' will be sent by vendor.Plase update status on invoice tracker on time.

Contract No: '" + lblcontractno.Text + "',
Contract Start Date: '" + lblfromdate.Text + "',
Contract End Date: '" + lbltodate.Text + "',
Contract Due Date: '" + lbltodate.Text + "'";
                        con.Open();
                        SqlDataReader reader = cmd.ExecuteReader();
                        if (reader.HasRows)
                        {
                            while (reader.Read())
                            {

                                string email = (string)reader["SPOCEmail"];
                                EmailAddresses.Add(email);
                            }
                        }
                        reader.Close();
                        cmd.Dispose();
                        con.Close();
                        foreach (string email in EmailAddresses)
                        {
                            SendEmail(email, "[email protected]", "Invoice Tracker Reminder Testing", txtMessageBody, true);
                           

                        }
                    }
                    else
                    {
                        string txtMessageBody = "Hi '" + lblOwnername.Text + "' ,
Your invoice '" + lblprojectname.Text + "'   is pending to upload on invoice tracker.

Contract No: '" + lblcontractno.Text + "',
Contract Start Date: '" + lblfromdate.Text + "',
Contract End Date: '" + lbltodate.Text + "',
Contract Due Date: '" + lbltodate.Text + "'";
                        con.Open();
                        SqlDataReader reader = cmd.ExecuteReader();
                        if (reader.HasRows)
                        {
                            while (reader.Read())
                            {

                                string email = (string)reader["SPOCEmail"];
                                EmailAddresses.Add(email);
                            }
                        }
                        reader.Close();
                        cmd.Dispose();
                        con.Close();
                        foreach (string email in EmailAddresses)
                        {
                            SendEmail(email, "[email protected]", "Invoice Tracker Reminder Testing", txtMessageBody, true);
                            

                        }
                    }
                }
                  
             }
            }
        }

        
    

    protected static void SendEmail(string toAddress, string fromAddress, string MailSubject, string Messagebody, bool isBodyHtml)
    {
        try
        {
            
          
               MailMessage mail = new MailMessage();
            
            mail.From = new MailAddress(fromAddress, "Invoice");
            mail.To.Add(toAddress);
            mail.Subject = MailSubject;
            mail.Body = Messagebody;
            mail.IsBodyHtml = isBodyHtml;
           

            //send the message

            SmtpClient smtp = new SmtpClient();
            smtp.UseDefaultCredentials = false;
            smtp.EnableSsl = true;
            smtp.Host = "smtp.gmail.com";
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            
            
            smtp.Credentials = new NetworkCredential("[email protected]", "password");
          
            smtp.Port = 587;
            smtp.Send(mail);
        }
        catch (System.Exception ex)
        {

        }
    }