Defining and checking a 2D string array

    class Board
    {
        private char[,] board;

        /// <summary>
        /// Get whether the board is valid, i.e. the board is a 3x3 board with only 'X', 'O' and '.' characters
        /// and the number of 'X' is equal to or one more than the number of 'O'
        /// </summary>
        /// <returns>True if the board is valid, false otherwise</returns>
        /// 

        // Need to also make sure that the number of o is not 1 less than x as x goes first.
        public bool IsValid()
        {
            // CHeck if both the rows and column of the board are in 3x3
            if (board.GetLength(0) != 3)
                return false;
            else if (board.GetLength(1) != 3)
                return false;

            else return true;
        }

        /// <summary>
        /// Constructor of the Board class. Fill the 2D board of characters using the lines array of strings.
        /// </summary>
        /// <param name="lines">The array of strings to fill the 2D board of characters</param>
        public Board(string[] lines)
        {
            // Constructor that creates a 3x3 array of characters (char)
            board = new char[3, 3];

        }

public class Game
{
    // Board field
    internal Board Board;

    // Constructor that takes in 3 strings that represents the board (this string is defined in program)
    public Game(string[] lines)
    {
        Board = new Board(lines);
    }

 Game game = new Game(lines);
if (game.Board.IsValid())
{
    Console.WriteLine($"Valid as hell");
    Console.WriteLine(game.HasWinner() ? $"The winner is: {game.GetWinner()}!" : "There is no winner!");
}
else
{
    Console.WriteLine("The board is invalid!");
}
Console.WriteLine("===========================");