Create A Custom 2 Dimensional Array Datastructure/class?

I want to create a user defined data structure, which will be a 2 dimensional array such that each individual square of this 2-dimensional array will also store the score and the grades. ( Iam using VB.NET) More details:

for example: There is an 2 dimensional array with 3 columns and 2 rows, I want to fill each of the

(0,0);(0,1);(0,2) with their own score (Integer type) and grades (String Type).

And this is same for the rest of the squares i.e. (1,0);(1,1);(1,2) and (2,0);(2,1);(2,2)

After creating such custom data structure: "CustomArray", I should be able to create the instance of this custom data structure (which will be a class) and code something like this:

Dim objCustomArray as CustomArray
objCustomArray = New CustomArray
for i as Integer =0 to 3

[code]....