Optimized code for 2 dimensional array

Question

I have a 2-dimensional array i need to convert first diagonal numbers in to zero,,for eg i need to convert first diagonal numbers of arrays[1 2 3 ] 5 9 5 3 2 1

means 1 9 1 in to zero that is the answer is just like [0 2 3] 5 0 5 3 2 0

Can you give me the required c# code in an Optimized way

Answer 1

All you're doing is setting the points in the grid to be zero when X and Y are equal. (1,1), (2,2), and so on;

int x = 4, y = 5;
int[,] array = new int[x,y]; // assume we initialize this with some values
for (int i = 0; i < x && i < y; i++ ) {
    array[i,i] = 0;
}