C#, 2d tömbhöz, ezt hogy oldjam meg?

// Two-dimensional array.

int[,] array2D = new int[,] { { 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 } };

//array2D[0,0] - 1

//array2D[0,1] - 2

//array2D[1,0] - 3

//array2D[1,1] - 4

3 x 4-es array:

0,0,0,0,

0,0,0,0,

0,0,0,0.

Ugyanez feltöltve:

4,2,9,1,

2,5,8,3,

6,5,1,2.

[0,0] = 4;

[0,2] = 9;

[2,0] = 6;

[2,3] = 2;