Implementing a TreeSize-like application with C#, SQL and Analysis Service, part 1

With background study of development I started my carrier in IT in the system admin branch, I couldn't imagine myself spending my life coding (urgh)
After 12 years in IT administration and management however I realized I spent these 12 years using my coding knowledge almost everyday, be it to develop system tools, debug poorly designed sql queries, or define development standard for my happy-go-lucky web devs!

The code I present may often need improvment, and may not respect some coding rules, please comment, give advice, and lots of feedback

thanks for reading