Building Basic Concepts of OOP

hi,
   i m new to c# and oop world, but i m pretty much fimiliar with structured programming (using c language). Right now i have two books on oop which are 1. How to program c# by dietel 2. Programming in c# by jesse liberty , both these books where suggested by my friends as well my teachers.But the problem is that up till i m unable to grasps the concept of object oriented programming ,the reason is that as their title say both these books sticks more towards programming in c# rather than OOP concepts :( (like for example i m till confuse in diffferenting overloading with overridding or what is the difference b/w the function of "new keyword" and "Overide keyword" ). Can u please suggest a good title for specially building the concepts of OOP or which emphasize more on OOP CONCEPTS rather than c# syntax
Thanks