Concept of Class Design /

Hi,

I am pretty new in OOPS programming . I am trying to search for the concepts of how to  design or build a class ? What is the necessary things should be kept in mind ? etc.. Can anybody provide some tutors/docs regrading this ? I come to know about a book "C# Class Design Handbook: Coding Effective Classes " but cant find the download link ? Please help

 

Thanks in advance