using System;

using FluentAssertions;

​

public class Program

{

    public static void Main()

    {

        var create = new PrivateAccess();

        var child = new PrivateAccess();

        create.SetChildPrivate(child, "Test");

​

        Console.WriteLine(create.Child.PrivateVariable == "Test");

    }

}

​

​

public class PrivateAccess

{

    public String PrivateVariable { get; private set; }

    public PrivateAccess Child { get; private set; }

    public void SetChildPrivate(PrivateAccess acc, string value) {

        acc.PrivateVariable = value;

        this.Child = acc;

    }

}