I was working on an Android project using Xamarin in Visual Studio 2012. I recently upgraded from an HDD to a SSD so I reinstalled Windows and all of my programs.
Af
Renamed Application name.
Added Package name.
App. started working on Emulator, Renamed application again, app. continued to run.
Note: Resetting device, un-installing the app. and related runtime etc. from settings did not work for me.
Hope this helps someone.