using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        SomeClass1 c1 = new SomeClass1();

        SomeClass2 c2 = new SomeClass2();

        c1.SetValue();

        c2.Printvalue();

        c2.SetValue();

        c1.Printvalue();

    }

}

​

​

public class SomeClass1

{

    public SingletonClass sing;

    public SomeClass1()

    {

        // Get 

        sing = SingletonClass.GetInstance();

    }

​

    public void SetValue()

    {

        sing.someValue = 12345;

    }

    public void Printvalue()

    {

        sing.PrintValue();

    }

}

​

public class SomeClass2

{

    public SingletonClass sing;

    public SomeClass2()

    {

        // Get 

        sing = SingletonClass.GetInstance();

    }

    public void SetValue()

    {

        sing.someValue = 5678;

    }

​

    public void Printvalue()

    {

        sing.PrintValue();

    }

}

​

​

public class SingletonClass

{

    // Make the instance private and static

    private static SingletonClass singletonInstance;

    // Make constructors private

    private SingletonClass()

    {

    }

    // Make static method

    public static SingletonClass GetInstance()

    {

        if (singletonInstance == null)

        {

            // First time initializing 

            singletonInstance = new SingletonClass();

        }

        return singletonInstance;

    }

    public int someValue { get; set; }

    // Non-static methods

    public void PrintValue()

    {

        Console.WriteLine(someValue);

    }

}