to answer your question:
1. is it possible to save PIN code?
No, it's not possible
2. How can I disable screen rotate?
A normal Android application can change this settings. Here you can find a sample app and how to use it from StageNow. The same code can be integrated in your Xamarin App.
great thanks for your reply ...
you save my time , that's so nice to find some help here and fast reply
we have buy 700 devices zebra TC 75 and we try to find the right way for to setup all device
too much work ...
have a nice day and thanks for your time