>> I still do not clearly understand about class etc.
>>
What you're asking is really more about going from a "procedural"
language like C (especially on embedded systems) to an "object oriented"
language like C++ or C# or Java, rather than the specifics of C# itself,
I think.  That's probably a harder question; and I'm not sure there are
any books that address the philosophical differences (I'm not sure that
there's wide consensus on what the differences SHOULD be.)  My 
observation
and perception (as a non OO-programmer) is that a lot of the advantage 
of
OO is being able to export much more complex programatic APIs (via 
things
like classes), and that a lot of "modern user application programming" 
is
more about finding existing (look-and-feel compatible) classes/etc than
actually writing new code.  And a lot of the "writing new code" guidance
is aimed at producing exportable and/or reusable classes.

BillW
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