private Account myAccount;
 
protected override void OnStateChange()
{
  if (State == State.SetDefaults)
  {
      // Initialize myAccount
  }

}

private void OnExecutionUpdate(object sender, ExecutionEventArgs e)
{
  // Cancel all orders if an execution is triggered after 9pm
  if (e.Time > new DateTime(now.Year, now.Month, now.Day, 21, 0, 0))
      myAccount.CancelAllOrders(e.Execution.Instrument);
}