VS 2012 [RESOLVED] Problem with an array of objects

I have an array that contains strings, numbers, dates and booleans. It has form-wide scope and is declared thus: When it comes to populating this array I fill all of the elements starting at 0 and ending at 39. This executes fine but when I inspect its contents at a breakpoint I discover that there are 41 elements in the array, starting at 0 and ending at 40.
Can someone please explain what's going on here?