public static List <SudokuPuzzle> ReadFile(String filename)
{
List <SudokuPuzzle> puzzles = new List <SudokuPuzzle>();
using (StreamReader stream = new StreamReader(new BufferedStream(File.OpenRead(filename))))
{
if (stream.EndOfStream)
{
throw new ArgumentException(BAD_FILE_ERRMSG);
}
while (!stream.EndOfStream)
{
puzzles.Add(SudokuPuzzle.CreateFromStream(stream));
}
}
return(puzzles);
}