void RegisterFranchiseTaxId(string taxId)
{
if (string.IsNullOrEmpty(this.Entity.TaxId))
{
var @event = new FranchiseTaxIdRegistered(this.Entity.ID, taxId);
this.Entity.Apply(@event);
}
else
{
throw new InvalidOperationException("Cannot change a businesses TaxId without change of ownership first.");
}
}
public void Apply(FranchiseTaxIdRegistered @event)
{
this.TaxId = @event.TaxId;
}
