500pts: OOP book for c#?

Hi there,

If anybody has any advice for a Object Oriented Programming book for use with C# (preferebly) i would really appreciate it..

I have been developing c# apps for a while now but i would really like to get a book that goes deep into application design using OOP. Of course i have been using OOP in c# but i don't think i really using it to its full potential.

For example, my inheritance a very few and far between etc.... I don't seem to be inheriting that much and i sure there are more times when i could be using inheritance (and other OOP stuff) more often.

I have quite a few books on C# (wrox), and other technologies but nothing oop specific.

I tried searching amazon but all i could find was OOP that wasn't specific to C# or it was quite an old book.

There are lots for VB.NET ....

Any ideas or advice would really be appreciated

Thanks in advance

Ian