idMso Value for Appendix in Word 2016 or any built is code?

Question

Please send me idMso value for Appendix in word 2010.

or  else send me built functions like below code

Selection wordSelection = Globals.ThisAddIn.Application.Selection;
wordSelection.set_Style(WdBuiltinStyle.wdStyleHeading1);

I shown for Heading 1 like that is there any Appendix is there?