Multithreading using c#

Program.cs==>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace multithreading
{
    class Program
    {
        static void Main(string[] args)
        {
            System.Console.WriteLine("the process has started");
            int[] arr = { 1, 2, 3, 4 };
            counting obj = new counting();
            counting obj1 = new counting();
            Thread mythread =new Thread(new ThreadStart(obj.run));
            Thread mythread1 = new Thread(new ThreadStart(obj1.run));
            mythread.Start();
            mythread1.Start();
        }
    }
}

//(create a new class called counting)

counting.cs==>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;

namespace multithreading

{

    class counting

    {

        string vthreadname;

        int a;

        public void Computing(string name)

        {

            vthreadname=name;

        }

        public void run()

        {

            System.Console.WriteLine("thread named "+vthreadname+"started");

            while(a<0)

            {

                System.Console.WriteLine("the value of a in thread:[ "+vthreadname+"]"+a.ToString());

                a=a+1;

                Thread.Sleep(1000);

            }

            System.Console.WriteLine("ended");

            Thread.Sleep(100000);

        }

    }

    }