// Online C# Editor for free

// Write, Edit and Run your C# code using C# Online Compiler

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading;

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public class HelloWorld

{

    public static Service s    {  get  { return Service.Instance; }    }

    public static Service s2    {  get  { return Service.Instance2; }    }

    public static void Main(string[] args)

    {

        PrintService(s);

        PrintService(s);

        PrintService(s2);

        PrintService(s2);

        Console.WriteLine("Inst 1, x=18    " + s.Testing(2));

        Console.WriteLine("Inst 2, x=??    " + s2.Testing());

        int z = Service.Instance.Testing(5);

        Console.WriteLine("passing x=5   " + z);

    }

​

    private static void PrintService(Service s)

    {

        Console.WriteLine("Name - " + s.Name);

        Console.WriteLine("Date - " + s.Date);

        Console.WriteLine("---------------------------------------");

        Thread.Sleep(2000);

    }

}

​

public class Service

{

    private static Service _instance;

    public static Service Instance

    {

        get

        {

            if(_instance == null)

            {

                _instance = new Service("Instance", DateTime.Now);

            }

            return _instance;

        }

    }

​

    public static Service Instance2

    {

        get

        {

            return  new Service("Instance 2", DateTime.Now);

        }

    }

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    public Service (string name, DateTime date)

    {

        Name = name;

        Date = date;

    }

​

    public string Name { get ; set; }

    public DateTime Date { get; set; }

    public int Testing(int x)

    {

        x= x+18;

        return x;

    }

​

    public int Testing()

    {

        Console.WriteLine("No variable sent");

        int y = 999;

        return y;

    }

​

​

}

​