Backgrounding with Xamarin and other useful links

Backgrounding 

http://docs.xamarin.com/guides/cross-platform/application_fundamentals/backgrounding/iOS 

Backgrounding with Tasks 

http://docs.xamarin.com/guides/cross-platform/application_fundamentals/backgrounding/part_3_ios_backgrounding_techniques/ios_backgrounding_with_tasks/offline.pdf

iOS Backgrounding Guidance

http://docs.xamarin.com/guides/cross-platform/application_fundamentals/backgrounding/part_5_ios_backgrounding_guidance/

Android Network Discovery 

http://developer.android.com/training/connect-devices-wirelessly/nsd.html

Compiling for Different Devices

http://docs.xamarin.com/guides/ios/advanced_topics/compiling_for_different_devices/

Memory and Performance Best Practices Techniques for Building Efficient Xamarin Applications 

http://docs.xamarin.com/guides/cross-platform/application_fundamentals/memory_perf_best_practices/#2.1.a-quick-overview-of-the-sgen-garbage-collector 

App Store Submission Tips 

https://developer.apple.com/appstore/resources/submission/tips.html