I am currently just exposing the properties through a generic interface e.g.

public interface IBaseClass
{
    int ID { get; set; }
}

internal class MyBaseClass : IBaseClass
{
    public MyBaseClass() { }
    public int ID { get; set; }
}

public class MyExposedClass : IBaseClass
{
    private MyBaseClass _base = new MyBaseClass();

    public int ID
    {
        get { return _base.ID; }
        set { _base.ID = value; }
    }
}

Then in my main application I can do:

IBaseClass c = new MyExposedClass();
c.ID = 12345;

But can't do:

MyBaseClass b = new MyBaseClass();

This is my desired behaviour.

However, I was just wondering if this is the correct approach? Or if there was a better way?