The Visual Studio Immediate Window is a great tool to increase your productivity. A lot of people are not aware that you can test functions in your program without writing any code by using this little tool. Look in the msdn entry for Immediate Window...

The System.IO namespace contains types that allow reading and writing to files and data streams, and types that provide basic file and directory support. Looking at all the streams classes, I sometimes get this overwhelmed feeling: which one do I use...