Classes and Structures

Question

I have the books, several actually, but am currently learning VB.net 2003 with "Beginning VB.net 2nd Edition by Wrox. I find it quite good although a few real life examples would be useful. I am having difficulty getting my head round Classes and Structures. Using properties, public and private and where to put them. Although the book puts it forward well I am still struggling with the concept. Does anyone know where I can read an article to help me along with this? Perhaps I need to read something on the concept of OOPS programming languages? For the moment I am a new and frustrated programmer getting very bogged down. Perhaps there is someone who has gone through the same problem as myself and has been able to see the woods for the trees - unlike me for the moment. Many thanks for any help.