using System;   

public class Program

{

    public static void Main()

    {

        var classA = new ClassA("Shaun Luttin");

        if(classA.Equals(classA.MyClassB1.MyClassA) &&

           classA.Equals(classA.MyClassB2.MyClassA) &&

           classA.MyClassB1.MyClassA.Equals(classA.MyClassB2.MyClassA))

        {

            Console.WriteLine("Hi my name is " + classA.Name);

            Console.WriteLine("Hi my name is also " + classA.MyClassB1.MyClassA.Name);

            Console.WriteLine("And my name too is " + classA.MyClassB2.MyClassA.Name);

            Console.WriteLine("They are the same object.");

        }

    }

}

​

public class ClassA

{

    public ClassB MyClassB1 { get; set; }

    public ClassB MyClassB2 { get; set; }

    public string Name { get; set; }

    public ClassA(string name)

    {

        this.Name = name;

        // pass `this` to the constructor

        this.MyClassB1 = new ClassB(this);

        // pass `this` directly to a property in `ClassB`

        this.MyClassB2 = new ClassB();

        this.MyClassB2.MyClassA = this;

    }

}

​

public class ClassB

{

    public ClassA MyClassA { get; set; }

    public ClassB() { }

    public ClassB(ClassA classA)

    {

        // do property assignment in the constructor

        this.MyClassA = classA;

    }

}