????? FileNotFoundException

using System;
using System.IO;
using System.Linq;

namespace ProductInventory
{
    public enum InventoryState
    {
        Full,
        Selling,
        Stocking,
        Empty,
        Unassigned
    }

    public class Product
    {
        public string GetProductDirectory(string productName)
        {
            string finalPath = $"{Environment.CurrentDirectory}\\products\\{productName}.txt";
            return finalPath;
        }

        public string ProductType;
        public double BulkPrice;
        public double RetailPrice;
        public int Quantity;
        public int MaxQuantity;
        public InventoryState Status;


        public string FileName;
        // defining the parameters for the constructor

        public Product(string FileName)
        {
            this.FileName = GetProductDirectory(FileName);
            ProductType = File.ReadLines(FileName).ElementAt(1);
            BulkPrice = Double.Parse(File.ReadLines(FileName).ElementAt(2));
            RetailPrice = Double.Parse(File.ReadLines(FileName).ElementAt(3));
            Quantity = Int32.Parse(File.ReadLines(FileName).ElementAt(4));
            MaxQuantity = Int32.Parse(File.ReadLines(FileName).ElementAt(5));
        } // the constructor
    }
    public class Program
    {
        public static string[] CommandList =
        {
            "status",
            "help",
            "exit"
        };

        public static Product[] ProductList =
        {
            new Product("Apple"),
            new Product("Blueberry")
        }; // TODO: make these values based on text files

        public static void Main()
        {
            string inputCommand, unformattedProduct, selectedProduct, stringStatus;
            bool isProduct = false;

            foreach (Product productName in ProductList)
            {
                if (productName.Quantity == productName.MaxQuantity)
                {
                    productName.Status = InventoryState.Full;
                }

                else if (productName.Quantity <= (productName.MaxQuantity * (0.5)))
                {
                    productName.Status = InventoryState.Stocking;
                }

                else if (productName.Quantity == 0)
                {
                    productName.Status = InventoryState.Empty;
                }

                else
                {
                    productName.Status = InventoryState.Selling;
                }
            }