What it sounds like is that you really need to understand a for loop. The wikipedia article on a for loop should help you out a bit...
http://en.wikipedia.org/wiki/For_loop
I'd highly suggest taking a read through it.
For C# though, a basic for loop can be broken down as such...
- for (<variable> = <start value>; <condition for ending>; <increment>) { ... }
The variable tells you what's controlling the loop and you can initialize it to a starting value. The condition for ending is generally a boolean logic test to see when the loop should finish. The increment is how much you want to change <variable> by on each iteration of the loop.
Hopefully this helps you out a bit. A big tip for being new to programming is to try hitting google with your questions. There's
tons of resources out there already that are readily available :)
Also, Tlhintoq has a really helpful macro type thing he posts in threads from time to time on the best way to find help on various things, especially for the .NET library. Hopefully he wanders in here and can post it for you.