seal a class without using 'Seal keyword'

Hi
To make a class "Sealed" means it can not be served as a "Base class" to any other class(es).

Without "sealed" keyword it can be achived following way,

1. Write an explicit constructor of the class, overwriting default system provided constructor.
2. Make the constructor as "private".

namespace N
{
    class A
    {
        private A()
        {

        }
    }
}

Above code is "equivalent" to a "sealed class", here class A have been made as sealed class, restricting other class(es) to derive from "A" irrespective of whatever the namespace is.

Let me know if that helps,