Factory pattern in C#: How to ensure an object instance can only be created by a factory class?

Question

Recently I\'ve been thinking about securing some of my code. I\'m curious how one could make sure an object can never be created directly, but only via some method of a fact

Answer 1

Yet another (lightweight) option is to make a static factory method in the BusinessObject class and keep the constructor private.

public class BusinessObject
{
    public static BusinessObject NewBusinessObject(string property)
    {
        return new BusinessObject();
    }

    private BusinessObject()
    {
    }
}