Question

I Declare an 2D Unlimited array.
My code:

Dim array As String(,) = New String(,) {}
        array(0, 0) = "top left"
        MsgBox(array(0, 0))

The problem is the msgbox shows nothing.

Answer 1

You can change the array bounds when needed with ReDim Preserve, which copies the existing array into an array with new dimensions.

But it might be simpler to use a List instead, which is “unlimited” (no need to specify range, or resize manually). But a list only has one dimension. To mimick a 2D array, you could have a List of Lists (each List item is a List itself).