public class LoanApplicationAggregate
{
  private Guid _applicationId;
  private LoanApplicationStatus _status;

  public void Approve()
  {
    if(_status != LoanApplicationStatus.Submitted)
    	throw new InvalidOperationException("Can only approve a submitted loan application");

    var e = new LoanApplicationApproved
    {
      Id = _applicationId;
    }
    Publish(e)
  }

  private void Publish(object e)
  {
  	_uncommittedEvents.Add(e);
  	Apply(e);
  }

  private void Apply(object e)
  {
  	_version++;
  	RedirectToWhen.InvokeEventOptional(this, e);
  }

  private void When(LoanApplicationApproved e)
  {
  	_status = LoanApplicationStatus.Approved;
  }
}