private void Button_Hint_Click(object sender, RoutedEventArgs e)
{
bool existsHint = SudokuGrid.GetHint();
if (!existsHint && ProgressBar_SudokuStatus.Value != 100)
{
ShowUnsolvableSudokuMessage();
}
else if (ProgressBar_SudokuStatus.Value != 100)
{
ClearMessage();
}
UpdateProgressBar();
}