Flood Fill Algorithm C#

Floodfill.cs

int[,] canvas = new int[,]
{
    {1, 1, 1, 1, 1, 1, 1, 1},
    {1, 1, 1, 1, 1, 1, 0, 0},
    {1, 0, 0, 1, 1, 0, 1, 1},
    {1, 2, 2, 2, 2, 0, 1, 0},
    {1, 1, 1, 2, 2, 0, 1, 0},
    {1, 1, 1, 2, 2, 2, 2, 0},
    {1, 1, 1, 1, 1, 2, 1, 1},
    {1, 1, 1, 1, 1, 2, 2, 1}
};

PrintCanvas(canvas);
Console.WriteLine();

var x = 0;
var y = 0;

FloodFill(canvas, x, y, canvas[x, y], 5);
PrintCanvas(canvas);


void FloodFill(int[,] canvas, int x, int y, int prevColor, int newColor)
{
    if (x >= 8 || y >= 8 || x < 0 || y < 0)
    {
        return;
    }

    if (canvas[x, y] != prevColor)
    {
        return;
    }

    canvas[x, y] = newColor;
    FloodFill(canvas, x + 1, y, prevColor, newColor);
    FloodFill(canvas, x - 1, y, prevColor, newColor);
    FloodFill(canvas, x, y + 1, prevColor, newColor);
    FloodFill(canvas, x, y - 1, prevColor, newColor);
}

void PrintCanvas(int[,] canvas)
{
    for (int i = 0; i < 8; i++)
    {
        for (int j = 0; j < 8; j++)
        {
            Console.Write(canvas[i, j] + " ");
        }
        Console.WriteLine();
    }
}