How to persist an enum using NHibernate

Why are you guys over complicating this? It is really simple.

The mapping looks like this:

<property name="OrganizationType"></property>

The model property looks like this:

public virtual OrganizationTypes OrganizationType { get; set; }

The Enum looks like this:

public enum OrganizationTypes
{
    NonProfit = 1,
    ForProfit = 2
}

NHibernate will automatically figure it all out. Why type more than you need????