How to use / declare a dynamic two-dimensional array?

First see this post about how to set up multi-dimensional arrays: Three methods, from worst to best IMHO :)

https://forums.garmin.com/showthread.php?366779-any-way-to-create-an-efficient-byte-array&p=930939#post930939

The third case might be best for what you want for another reason - app settings defines the size. Once you know dim1 and dim2,
you just allocated it with:

var array=new[dim1*dim2];

When accessing it, for what you think of as array[i,j], you use something like array[dim1*i+j] instead.

Thank you very much Jim. The third case works flawlessly.