Converting index of one dimensional array into two dimensional array i. e. row and column

Question

I have one application of WinForms which inside list box I am inserting name and price..name and price are stored in two dimensional array respectively. Now when I select one record from the listbox it gives me only one index from which I can get the string name and price to update that record I have to change name and price at that index for this I want to update both two dimensional array name and price. but the selected index is only one dimensional. I want to convert that index into row and column. How to do that?

But I'm inserting record in list box like this.

int row = 6, column = 10;
for(int i=0;i<row;i++)
{
    for(int j=0;j<column;j++)
    {
        value= row+" \t "+ column +" \t "+ name[i, j]+" \t " +price[i, j];
        listbox.items.add(value);
    }
}

Solution 1

While I didn't fully understand the exact scenario, the common way to translate between 1D and 2D coordinates is:

From 2D to 1D:

index = x + (y * width)

or

index = y + (x * height)

depending on whether you read from left to right or top to bottom.

From 1D to 2D:

x = index % width
y = index / width 

or

x = index / height
y = index % height

Solution 2

For converting 1D indices to and from 3D indices:

(int, int, int) OneToThree(i, dx, dy int) {
    z = i / (dx * dy)
    i = i % (dx * dy)
    y = i / dx
    x = i % dx
    return x, y, z
}

int ThreeToOne(x, y, z, dx, dy int) {
    return x + y*dx + z*dx*dy
}