OOP in VB main ideas

https://msdn.microsoft.com/en-us/library/aa289512(v=vs.71).aspx

n-tier architecture in ASP.NET with Visual Studio 2013

https://en.wikipedia.org/wiki/Multitier_architecture


http://www.asp.net/web-forms/overview/getting-started/getting-started-with-aspnet-45-web-forms/create_the_data_access_layer - čia galima atsisiųsti tutorialą

Garbage collection links

https://msdn.microsoft.com/en-us/library/system.idisposable(v=vs.110).aspx

https://msdn.microsoft.com/en-us/library/0xy59wtx(v=vs.110).aspx