On a side note. I actually have Notepad++ open all .cs files by default. As I generally only ever open a C# file directly like that for a quick simple edit. So no reason firing up VS for a quick edit, as it's a rather large and resource heavy app. However, I almost always have VS open too. So I generally do all of my changes form there, as most people SHOULD.
Using a proper IDE is very important when working with a programming language. If you're using Notepad++/Programmers Notepad/Notepad/ect for all of your development, you are most definitely doing it wrong. A proper IDE will save you all sorts of headaches with errors, tracking down bugs, viewing source more easily (can right click most types and go directly to the definition, or even find all references) and much more. Although you benefit even more if you're working on your stuff with a properly setup solution. Using the ServUO solution and writing your new stuff from within the entire solution, you'll find it even easier.