Limiting keystroke in web application

if (e.keyCode != 8 && e.keyCode != 37 && e.keyCode != 38 && e.keyCode != 39 && e.keyCode != 40 && e.which != 8 && e.which != 37 && e.which != 38 && e.which != 39 && e.which != 40) {
      return true;
}
else {
CodeProject       return false;
}