I think almost every question have been answered , if one has to search for everything then it is not more a forum, it would be like google search.
After all , my same question would give some newcomer to answer it and enforces his/her learning. This is what a benefit of forum is at the first place.
Of course, for such questions Google search (or a forum search) is far more efficient than posting to a forum. You'll find an answer much quicker that way.
It's not a very helpful question to give a newcomer anyway, because the answer is simply "the designers of the language decided to do it that way". They could have decided to make it work another way, but they didn't. it has the advantage that for any given public class, it's very easy to identify which file it's in.
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com