Simple Thread Programming in C#

// creating and starting threads
using System;
using System.Threading;
public class AOne
{
    public void First()
    {
        Console.WriteLine("First methode of AOne class is running on T1 thread.");
        Thread.Sleep(1000);
        Console.WriteLine("The First method called by T1 thread has ended.");
    }
   
    public static void Second()
    {
        Console.WriteLine("First methode of AOne class is running on T1 thread.");
        Thread.Sleep(2000);
        Console.WriteLine("The First method called by T1 thread has ended.");
    }   
}

public class ThreadExp
{
    public static int Main(string[] args)
    {
        Console.WriteLine("Example of Threading");
        AOne a = new AOne();
        Thread T1 = new Thread(new ThreadStart(a.First));  //creating thread T1
        T1.Start();    //Strating thread T1
        Console.WriteLine("T1 thread  started.");
        Thread T2 = new Thread(new ThreadStart(AOne.Second));  //creating thread T2
        T2.Start();    //starting thread T2
        Console.WriteLine("T2 thread started.");
        return 0;
    }
}
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// 2nd Program------using timer
using System;
using System.Collections.Generic;
using System.Text;
using System.Timers;

namespace ThreadTimers
{
    class Program
    {
        static void Main()
        {
            Timer time = new Timer();  //Doesn't require any args
            time.Interval = 1000;
            time.Elapsed += time_Elapsed;    //uses an event
            time.Start();      //start the timer
            Console.ReadLine();
            time.Stop();
            Console.WriteLine("Timer Thread stopped. Enter again to start. \n Twice entering would
                                                               destroy the thread.");              //pause the timer
            Console.ReadLine();
            time.Start();           //Resume the timer
            Console.ReadLine();
            Console.WriteLine("Thread destroyed!");
            time.Dispose(); //Destroy the timer Thread
        }
       
        static void Display(object ObjTime)
        {
            //This runs on a pooled thread            
            Console.WriteLine(ObjTime);            //Writes "tick..."
        }
       
        static void time_Elapsed (object sender, EventArgs e)
        {
            Console.Write("The Time is passing by: ");
            Console.WriteLine(DateTime.Now);
        }
    }
}