Why are you using an array? You an enum; this is exactly what they are for :)
Put the enum in the global code, and you'll be able to reuse it throughout the project. I'm not entirely sure of the exact name, as it's been a while since I worked with TBH, but there's definitly something like "Globals", that I use for similar stuff.
Another tip I would give you is to first use a date, and then a month. I.e. 200802 for February 2008, and 200803 for March. The easiest way to accomplish this is by doing something along the lines of the following:
SQL: SELECT YEAR(GETDATE()) * 100 + MONTH(GETDATE())
C#: Convert.ToString(((DateTime.Now.Year * 100) + DateTime.Now.Month))
Reason for this is that itâs far easier to perform calculations and proper sorting :)
HTH.
http://entropia-online.blogspot.com/