Matriz de estructura y menú Ejercicio C# - Curso de Programación C# (C Sharp)

using System;
public class exercise81
{
    struct points
    {
        public byte x;
        public byte y;
    }
    static void Main(string[] args)
    {
        points[] p = new points[1000];
        bool Finish = false;
        int countArray = 0;
        int TotalX = 0;
        int TotalY = 0;
        do
        {
            Console.WriteLine("1.Add data for one point");
            Console.WriteLine("2.Display all the entered points");
            Console.WriteLine("3.Calculate (and display) the average values for x and y");
            Console.WriteLine("0.Exit the program");
            Console.Write("Enter a number: ");
            byte respuesta = Convert.ToByte(Console.ReadLine());
            switch (respuesta)
            {
                case 1:
                    Console.WriteLine();
                    Console.Write("Enter a number for point x: ");
                    p[countArray].x = Convert.ToByte(Console.ReadLine());
                    TotalX += p[countArray].x;
                    Console.WriteLine();
                    Console.Write("Enter a number for point y: ");
                    p[countArray].y = Convert.ToByte(Console.ReadLine());
                    TotalY += p[countArray].y;
                    Console.WriteLine();
                    countArray++;
                    break;
                case 2:
                    if (countArray > 0)
                    {
                        for (int i = 0; i < countArray; i++)
                        {
                            Console.WriteLine("Valor x{0}: {1}", i + 1, p[i].x);
                            Console.WriteLine("Valor y{0}: {1}", i + 1, p[i].y);
                        }
                    }
                    else
                        Console.WriteLine("No hay datos");
                    break;
                case 3:
                    if (countArray > 0)
                    {
                        Console.WriteLine("Average x: {0}", TotalX / countArray);
                        Console.WriteLine("Average y: {0}", TotalY / countArray);
                    }
                    else
                        Console.WriteLine("No hay datos");
                    break;
                case 0:
                    Finish = true;
                    break;
                default:
                    break;
            }
        }
        while (!Finish);
    }
}