using System;

using System.Threading.Tasks;

using System.Threading;

public class Program

{

    public class Obj 

    {

        public int Value {get; set;}

    }

    public static void Main()

    {

        //Creating object

        var obj = new Obj(){Value =8 };

        Console.WriteLine("Before: " + obj.Value);      

        Console.WriteLine("Starting task");     

        //Passing object to a method which runs concurrently and startig it

        var task = Task.Factory.StartNew(()=>SendMessage(obj));

        //Chaging internal property of an object

        Console.WriteLine("Changing value");    

        Change(obj);

        Console.WriteLine("After: " + obj.Value);   

        task.Wait();

    }

    public static void Change(Obj obj)

    {

        obj.Value = 42;

    }

    public static void SendMessage(Obj obj)

    {

        Console.WriteLine("Inside Send: " + obj.Value);

    }

}