How to modify a foreach iteration variable from within foreach loop?

Question

When I try to do this...

Item[,] array = new Item[w, h];  // Two dimensional array of class Item, 
                                 //   w, h are unknown at          


        

Answer 1

Not knowing the size isn't a problem:

for (int i = 0; i < twoDimArray.GetLength(0); i++)
{
    for (int j = 0; j < twoDimArray.GetLength(1); j++)
    {
        twoDimArray[i, j] = ...
    }
}