How immediately start a service after it's installation?

{ To automatically start a service after its installation use this code }

procedure TMyService.ServiceAfterInstall(Sender: TService);
var
  sm: TServiceManager;
begin
  sm := TServiceManager.Create;
  try
    if sm.Connect then
      if sm.OpenServiceConnection(self.name) then
        sm.StartService;
  finally
    sm.Free;
  end;
end;