private static bool isNumberInParticularBlock(int x, int y, Number item) { return((item.x <= x * 3 && item.x > (x - 1) * 3) && (item.y <= y * 3 && item.y > (y - 1) * 3)); }
private static void SetInitialNumber(int number, Number num) { num.number = number; num.initial = true; num.isEmpty = false; }