TryTiming.cs

using System;
using System.Diagnostics;
using System.Threading;
using System.Timers;

namespace TryTiming
{
    class Program
    {
        static void Main(string[] args)
        {
            //--- Stopwatch example
            Stopwatch stopwatch = new Stopwatch();

            // Begin timing.
            stopwatch.Start();

            // Run for roughly 1 second and plot the stopwatch time.
            for (int i = 0; i < 1000; i++)
            {
                Thread.Sleep(1);
                Console.SetCursorPosition(0, 0);
                Console.Write("Stopwatch: {0} msec", stopwatch.ElapsedMilliseconds);
            }

            // Stop timing.
            stopwatch.Stop();

            // Write result.
            Console.ForegroundColor = ConsoleColor.Red;
            Console.SetCursorPosition(0, 1);
            Console.Write("Elapsed: {0} msec", stopwatch.ElapsedMilliseconds);
            Console.ResetColor();

            stopwatch.Reset();

            //--- Timer example
            System.Timers.Timer t = new System.Timers.Timer(1500);
            t.Elapsed += new ElapsedEventHandler(OnTimerElapsed);
            t.Enabled = false; // disabled at the beginning

            Console.SetCursorPosition(0, 2);
            Console.WriteLine("Press 'a' to exit.");
            Console.WriteLine("Press 'q' to disable timer.");
            Console.WriteLine("Press 'w' to enable timer.");
            Console.SetCursorPosition(0, 0);

            while (true) {

                ConsoleKey pressedKey = Console.ReadKey(true).Key;

                if (pressedKey.Equals(ConsoleKey.A))
                {
                    break;
                }
                if (pressedKey.Equals(ConsoleKey.Q))
                {
                    Console.SetCursorPosition(0, Console.WindowHeight-2);
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.Write(string.Format("{0,50}", "timer disabled"));
                    Console.SetCursorPosition(0, 0);

                    t.Enabled = false;
                }
                if (pressedKey.Equals(ConsoleKey.W))
                {
                    Console.SetCursorPosition(0, Console.WindowHeight-2);
                    Console.ForegroundColor = ConsoleColor.Green;
                    Console.Write(string.Format("{0,50}", "timer enabled " + DateTime.Now));
                    Console.SetCursorPosition(0,0);

                    t.Enabled = true;
                }
            }
        }

        static void OnTimerElapsed(object sender, ElapsedEventArgs e)
        {
            Console.SetCursorPosition(0, 5);
            Console.Write($"Timer triggered at {DateTime.Now}");
            Console.SetCursorPosition(0, 0);

            Console.SetCursorPosition(0, Console.WindowHeight - 2);
            Console.ForegroundColor = ConsoleColor.Red;
            Console.Write(string.Format("{0,50}", "timer disabled"));
            Console.SetCursorPosition(0, 0);
            
            ((System.Timers.Timer)sender).Enabled = false; // disable the timer after the initial trigger, t.Enabled = false;
        }

    }
}