If you are managing more then one web server its tough to manage everyone and check ragularly . so i have metion the code which send email notification when the server is down .
It ping production server and check
using System;
using System.Net;
using System.Net.NetworkInformation;
using System.Text;
using System.Configuration;
using System.Net.Mail;
namespace PingServer
{
    public class PingExample
    {
        
        public static void Main(string[] args)
        {
            try
            {
                Ping ping = new Ping();
                string sServers = ConfigurationManager.AppSettings["SERVER_LIST"];
                string [] sServerList = sServers.Split(',');
                foreach (string server in sServerList)
                {
                    try
                    {
                        PingReply reply = ping.Send(server);
                        if (reply.Status == IPStatus.Success)
                            Console.WriteLine("Server " + server + " running");
                        else
                        {
                            Console.WriteLine("Server " + server + " down");
                            SendMail("Server " + server + " down", "SERVER_STATUS", new string[] { "me@mycompany.com", "mymanager@mycompany.com" });
                        }
                    }
                    catch
                    {
                        Console.WriteLine(server + " is not reachable.Exception raised by ping.Send()");
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            Console.Read();
        }
        public static void SendMail(String message, String subject, String[] notificationList)
        {
            try
            {
                MailMessage MyMessage = new MailMessage();
                MyMessage.From = new MailAddress("me@mycompany.com");
                foreach (String email in notificationList)
                    MyMessage.To.Add(new MailAddress(email));
                MyMessage.Subject = subject;
                MyMessage.Body = message;
                SmtpClient emailClient = new SmtpClient("smtp.me.mycompany.com");
                emailClient.Send(MyMessage);
            }
            catch
            {
            }
        }
    }
}