you can't but you have 2 options.
You can declare const like const MAX_ITEMS AS INTEGER before declaring
variables (see example 1)
Another option is not using a fixed array but a variable size array
(see example 2)
Hope this helps.

example 1
CONST MAX_ITEMS AS INTEGER=10
Dim myArray(0 To MAX_ITEMS ) As String

Example 2
option base 1
dim n as integer
dim myArray() as string
n=15
redim myArray(1 to n)

Jimmy wrote:
Dim myArray(0 To n) As String

The dimensions of this array change throughout.

Why can't I use the variable 'n' in the declaration?

And, more importantly, can someone help me solve this problem?

Thanks,

Jimmy