using System;

​

public class Client

{

    public Client()

    {

        // We don't know what the default could be

        RequireConsent = true;

    }

    public bool RequireConsent

    {

        get;

        set;

    }

}

​

public class ClientBuilder

{

    private bool ? requireConsent;

    public ClientBuilder RequireConsent()

    {

        requireConsent = true;

        return this;

    }

​

    public ClientBuilder DoNotRequireConsent()

    {

        requireConsent = false;

        return this;

    }

​

    public Client Build()

    {

        var client = new Client();

        if (requireConsent.HasValue)

        {

            client.RequireConsent = requireConsent.Value;

        }

    }

}