internal interface I$Product$
{
}

internal enum $Product$Type
{
    Concrete$Product$A,
    Concrete$Product$B
}

internal class Concrete$Product$A : I$Product$
{
}

internal class Concrete$Product$B : I$Product$
{
}

internal class $Product$FactoryOption1
{
    internal I$Product$ Create$Product$($Product$Type type)
    {
        switch (type)
        {
            case $Product$Type.$ConcreteProductA$:
                return new Concrete$Product$A();
            case $Product$Type.$ConcreteProductB$:
                return new Concrete$Product$B();
            default:
                throw new System.ArgumentException("type");
        }
    }
}

internal abstract class Abstract$Product$FactoryOption2
{
    internal abstract I$Product$ Create$Product$();
}

internal class Concrete$Product$FactoryAOption2 : Abstract$Product$FactoryOption2
{
    internal override I$Product$ Create$Product$()
    {
        return new Concrete$Product$A();
    }
}

internal class Concrete$Product$FactoryBOption2 : Abstract$Product$FactoryOption2
{
    internal override I$Product$ Create$Product$()
    {
        return new Concrete$Product$B();
    }
}


// First option - swtich case
// var factory = new $Product$Factory();
//var Concrete$Product$A = factory.Create$Product$($Product$Type.Concrete$Product$A);
//var Concrete$Product$B = factory.Create$Product$($Product$Type.Concrete$Product$B);
// Second Option - inheritance
// var factory = new Concrete$Product$FactoryAOption2();
//var $ConcreteProductA$ = factory.Create$Product$();
//var $ConcreteProductB$ = factory.Create$Product$();