Tutorials
Programming Tutorials in C#
http://msdn.microsoft.com/en-us/library/aa288436%28v=vs.71%29.aspx
http://www.tutorialspoint.com/csharp/index.htm
http://csharp.net-tutorials.com/
Object Oriented Programming in VB.NET
http://www.codeproject.com/Articles/8825/Object-Oriented-Programming-In-VB-NET
Mobile Development
http://mobile.smashingmagazine.com/2013/11/22/four-ways-to-build-a-mobile-app-part1-native-ios/
http://mashable.com/2012/05/09/building-cheap-mobile-app/
Developer Training
Code School: https://www.codeschool.com/