C# - Program to manage orders in a Restaurant.

A simple console program to manage orders in a Restaurant.
CODE
using System;
using System.Collections.Generic;

class Item
{
    private string itemName;
    private double itemPrice;
    private int id;

    public int ID { get => id;}
    public double ItemPrice { get => itemPrice; }

    public Item(int id, string itemName, double itemPrice)
    {
        this.id = id;
        this.itemName = itemName;
        this.itemPrice = itemPrice;
    }

    public override string ToString()
    {
        string result = "";

        result += id + ". " + itemName + "\t: " + itemPrice.ToString("0.00");

        return result;
    }
}

class Items : List<Item>
{
    private static int ID_COUNTER = 1;

    public Items()
    {
        this.Add(new Item(ID_COUNTER, "Chicken Dlght Pizza", 245.00)); ID_COUNTER++;
        this.Add(new Item(ID_COUNTER, "Chicken Normal Pizza", 200.00)); ID_COUNTER++;
        this.Add(new Item(ID_COUNTER, "Veg Normal Pizza", 120.00)); ID_COUNTER++;
        this.Add(new Item(ID_COUNTER, "Veg Special Pizza", 150.00)); ID_COUNTER++;
    }

    public bool IsIDvalid(string userInput, out int id)
    {
        bool result = false;

        bool flag = int.TryParse(userInput, out id);
        if (flag)
        {
            if (id > 0 && id < ID_COUNTER)
                result = true;
        }

        return result;
    }

    public override string ToString()
    {
        string result = "";

        int i = 0;
        foreach(Item item in this)
        {
            result += item.ToString();
            if(i < this.Count-1)
                result += "\n";
            i++;
        }

        return result;
    }

    public Item GetItem(int id)
    {
        return this.Find(a => a.ID == id);
    }
}

class Order
{
    private Item item;
    private int quantity;
    private double total;

    public double Total { get => total; }

    public Order(Item item, int quantity)
    {
        this.item = item;
        this.quantity = quantity;
        this.total = quantity * item.ItemPrice;
    }

    public override string ToString()
    {
        string result = item.ToString() + "\n";
        result += "Quantity: " + quantity + "\n";
        result += "Total: " + total;

        return result;
    }
}

class Program
{
    public static void Main(string[] args)
    {
        try
        {
            Items items = new Items();
            List<Order> orders = new List<Order>();

            while (true)
            {
                string userInput = getMenuInput(items);
                if (userInput == "x")
                    break;

                int id = -1;
                if (items.IsIDvalid(userInput, out id))
                {
                    int quantity = getItemCountInput();
                    if (quantity < 1)
                        Console.WriteLine("Invalid quantity.");
                    else
                    {
                        Order order = new Order(items.GetItem(id), quantity);
                        orders.Add(order);
                    }
                }
                else
                    Console.WriteLine("Invalid choice.");

                Console.WriteLine("");
            }

            getBill(orders);
        }
        catch(Exception ex)
        {
            Console.WriteLine("Error: " + ex.Message);
        }

        Console.WriteLine("Thanks. Good Bye. Press any key to exit.");
        Console.ReadKey();
    }

    public static string getMenuInput(Items items)
    {
        Console.WriteLine(items);
        Console.WriteLine("x: Exit");
        Console.Write("Enter your choice: ");
        return Console.ReadLine().Trim().ToLower();
    }

    public static int getItemCountInput()
    {
        Console.Write("How many items? ");
        string userInput = Console.ReadLine().Trim();
        int quantity = -1;
        int.TryParse(userInput, out quantity);
        return quantity;
    }

    public static void getBill(List<Order> orders)
    {
        double orderTotal = 0.0;
        Console.WriteLine("\nBILL:");
        foreach (Order order in orders)
        {
            Console.WriteLine(order);
            orderTotal += order.Total;
        }
        Console.WriteLine("\nORDER TOTAL: " + orderTotal);
    }
}
INPUT & OUTPUT
The below is the output of the program.
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C# - Program to manage orders in a Restaurant.

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