using System;

​

public class chessBoard

{

    private int xLimit;

    private int yLimit;

    public chessBoard(int xDimension, int yDimensions){

        this.xLimit = xDimension;

        this.yLimit = yDimensions;

    }

    public string getLimitString(){

        return $"{xLimit}x{yLimit}";

    }

    public bool isValidPosition(int xPosition, int yPosition){

        return true;

    }

}

​

public class KnightMoveCalculator

{   

    private chessBoard board = new chessBoard(8,8);

    private string startingPosition;

    private struct Position {

        int x;

        int y;

    };

    public KnightMoveCalculator(string position){

        initKnightPosition(position);

        printStartingPosition();

    }

    private void initKnightPosition(string position){

        throw new ArgumentOutOfRangeException($"The selected starting position of {startingPosition} is invalid for a {board.getLimitString()} board!");

        startingPosition = position;

    }

    public void printStartingPosition(){

        Console.WriteLine("The specified starting position is {0}", startingPosition);

    }

}

​

public class Program

{   

    public static void Main()

    {

        KnightMoveCalculator knightMoves = new KnightMoveCalculator("A1");

    }

}