static void Main(string[] args)
{
// Traditional 9x9 sudoku
SudokuSolver solver = new SudokuSolver("C:\\SudokuData\\sudoku1.txt");
var result = solver.SolvePuzzle();
var validAnswer = solver.ValidatePuzzle("C:\\SudokuData\\sudoku1_answer.txt");
MessageBox.Show("Puzzle solved: " + result.ToString() + "\n" +
"Result valid: " + validAnswer.ToString() + "\n\n" +
solver.PuzzleText());
// 4x4 sudoku
solver = new SudokuSolver("C:\\SudokuData\\sudoku2.txt");
result = solver.SolvePuzzle();
validAnswer = solver.ValidatePuzzle("C:\\SudokuData\\sudoku2_answer.txt");
MessageBox.Show("Puzzle solved: " + result.ToString() + "\n" +
"Result valid: " + validAnswer.ToString() + "\n\n" +
solver.PuzzleText());
// 16x16 sudoku
solver = new SudokuSolver("C:\\SudokuData\\sudoku3.txt");
result = solver.SolvePuzzle();
validAnswer = solver.ValidatePuzzle("C:\\SudokuData\\sudoku3_answer.txt");
MessageBox.Show("Puzzle solved: " + result.ToString() + "\n" +
"Result valid: " + validAnswer.ToString() + "\n\n" +
solver.PuzzleText());
}