C++ -> C#:

MSDE: C++ -> C#: What You Need to Know to Move from C++ to C#

MSDN How to: Retrieve List Items

MSDN How to: Retrieve List Items

Notepad

A C# project that implements a Notepad like application is a good way to demonstrate the fundemental concepts involved in developing a forms based app.
Here is a good tutorial.
Here is a good notepad C# project source.