DDE Method AppExit() does not exit Adobe Reader DC

We have code previously using AppExit() method to close Adobe Reader 11 after printing using DDE. Now with Adobe Reader DC, the same AppExit() method only exit the currently opened document, but the Adobe Reader DC application is still opened.

Does anyone know what is the DDE method we should use to exit Reader DC application instead of the opened document? Or how should we exit the application using DDE? Much appreciated!