public void UpgradeMembership()
{
var @event = new MembershipLevelUpgradedEvent(Id, DateTime.UtcNow, Version);
ApplyEvent(@event);
AppendEvent(@event);
}
public void ApplyEvent(MembershipLevelUpgradedEvent simpleEvent)
{
Type = (Type == MembershipType.Level1)
? MembershipType.Level2
: (Type == MembershipType.Level2)
? MembershipType.Level3
: Type;
Version++;
}