I have a problem I need answered ASAP. I was tasked with writing a simple C# form that does a fundamentally simple but from a coding standpoint, complex mathematical task. The method is called Lattice Multiplication, and it is a simple, matrix-based way to multiply large numbers. Here is a video that will easily explain it if you are not familiar:

http://www.youtube.com/watch?v=VoXJA-9WzNI
I have attached what I came up with thus far. The code is commented and fleshed out up to the point where I multiply the digits to get a linear array of two characters (the products of each multiple) per index. I am completely stumped what to do next. I came here as a last resort because I simply cannot figure this out.

This is a time sensitive matter so I would appreciate any and all help in advance.

Thank you.

default.aspx
default.aspx.cs