RPG inventory

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// RPG inventory program

using System;
using System.Collections.Generic;

class Submission
{
    // -------------------------
    // Subprograms
    // -------------------------
    static void add_item(List<string> inventory)
    {
        Console.WriteLine("What item are you adding to your inventory?");
        string item = Console.ReadLine();
        inventory.Add(item);
        Console.WriteLine("Item added.");
    }

    static void search(List<string> inventory)
    {
        Console.WriteLine("What item do you want to see if you have?");
        string item = Console.ReadLine();
        if (inventory.Contains(item))
        {
            Console.WriteLine("You have the item.");
        }
        else
        {
            Console.WriteLine($"You do not have a {item}");
        }
    }


    static void drop_item(List<string> inventory)
    {
        Console.WriteLine("What item do you want to drop?");
        string item = Console.ReadLine();
        // Check item exists
        if (inventory.Contains(item))
        {
            inventory.Remove(item);
            Console.WriteLine("Item dropped.");
        }
        else
        {
            Console.WriteLine("You do not have this item.");
        }
    }


    static void look(List<string> inventory)
    {
        Console.WriteLine("Which inventory slot do you want to look at?");
        int slot = Convert.ToInt32(Console.ReadLine());
        if (slot < inventory.Count) {
            Console.WriteLine($"You have a {inventory[slot]} in slot {slot}");
        }
        else
        {
            Console.WriteLine("Invalid slot.");
        }
    }


    // Returns false when the player chooses to quit.
    static bool choose_action(List<string> inventory)
    {
        Console.WriteLine($"You have {inventory.Count} items in your inventory.");
        Console.WriteLine("What action do you want to take? (add/look/drop/search/quit)");
        string action = Console.ReadLine();
        switch (action)
        {
            case "add":
                add_item(inventory);
                break;
            case "drop":
                drop_item(inventory);
                break;
            case "look":
                look(inventory);
                break;
            case "search":
                search(inventory);
                break;
            case "quit":
                return false;
        }
        Console.WriteLine();
        return true;
    }


    // -------------------------
    // Main program
    // -------------------------
    public static void Main(string[] args)
    {
        List<string> inventory = new List<string>() {"sword", "shield"};
        while (choose_action(inventory)) {
        }
    }

}