errr... you should at least google it first, and then ask question once you tried it and didn't work XD

but basically you need to learn how to use class in C#, it's similar to Java :D

Google has their Excel :D
you can use it for free :)

seperate CSS file :) it's much more organized hehe.. give example?

* {
background-color: #000000
}

in something.css

practice practice practice, with problems :D solve puzzles.. solve math problems..

there are many introduction out there.. :-/ pelase to go Google, and post problems :D

lol.... sometimes it's funny :)

you probably need to ask about codes :D since we're all programmers. we love to see codesss :D